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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
|
/* packet-ethertype.c
* Routines for processing Ethernet payloads and payloads like Ethernet
* payloads (i.e., payloads when there could be an Ethernet trailer and
* possibly an FCS).
*
* $Id$
*
* Gilbert Ramirez <gram@alumni.rice.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include "packet-eth.h"
#include "packet-frame.h"
#include "packet-ip.h"
#include "packet-ipv6.h"
#include "packet-ipx.h"
#include "packet-vlan.h"
#include "packet-ieee8021ah.h"
#include "packet-vines.h"
#include <epan/etypes.h>
#include <epan/ppptypes.h>
static dissector_table_t ethertype_dissector_table;
static dissector_handle_t data_handle;
const value_string etype_vals[] = {
{ ETHERTYPE_IP, "IP" },
{ ETHERTYPE_IPv6, "IPv6" },
{ ETHERTYPE_VLAN, "802.1Q Virtual LAN" },
{ ETHERTYPE_ARP, "ARP" },
{ ETHERTYPE_WLCCP, "Cisco Wireless Lan Context Control Protocol" },
{ ETHERTYPE_CENTRINO_PROMISC, "IEEE 802.11 (Centrino promiscuous)" },
{ ETHERTYPE_XNS_IDP, "XNS Internet Datagram Protocol" },
{ ETHERTYPE_X25L3, "X.25 Layer 3" },
{ ETHERTYPE_WOL, "Wake on LAN" },
{ ETHERTYPE_WMX_M2M, "WiMax Mac-to-Mac" },
{ ETHERTYPE_EPL_V1, "EPL_V1" },
{ ETHERTYPE_REVARP, "RARP" },
{ ETHERTYPE_DEC_LB, "DEC LanBridge" },
{ ETHERTYPE_ATALK, "Appletalk" },
{ ETHERTYPE_SNA, "SNA-over-Ethernet" },
{ ETHERTYPE_DLR, "EtherNet/IP Device Level Ring" },
{ ETHERTYPE_AARP, "AARP" },
{ ETHERTYPE_IPX, "Netware IPX/SPX" },
{ ETHERTYPE_VINES_IP, "Vines IP" },
{ ETHERTYPE_VINES_ECHO, "Vines Echo" },
{ ETHERTYPE_TRAIN, "Netmon Train" },
/* Ethernet Loopback */
{ ETHERTYPE_LOOP, "Loopback" },
{ ETHERTYPE_FOUNDRY, "Foundry proprietary" },
{ ETHERTYPE_WCP, "Wellfleet Compression Protocol" },
{ ETHERTYPE_STP, "Spanning Tree Protocol" },
/* for ISMP, see RFC 2641, RFC 2642, RFC 2643 */
{ ETHERTYPE_ISMP, "Cabletron Interswitch Message Protocol" },
{ ETHERTYPE_ISMP_TBFLOOD, "Cabletron SFVLAN 1.8 Tag-Based Flood" },
/* In www.iana.org/assignments/ethernet-numbers, 8203-8205 description is
* Quantum Software. Now the company is called QNX Software Systems. */
{ ETHERTYPE_QNX_QNET6, "QNX 6 QNET protocol" },
{ ETHERTYPE_PPPOED, "PPPoE Discovery" },
{ ETHERTYPE_PPPOES, "PPPoE Session" },
{ ETHERTYPE_INTEL_ANS, "Intel ANS probe" },
{ ETHERTYPE_MS_NLB_HEARTBEAT, "MS NLB heartbeat" },
{ ETHERTYPE_HOMEPLUG, "Homeplug" },
{ ETHERTYPE_IEEE_802_1AD, "802.1ad Provider Bridge (Q-in-Q)" },
{ ETHERTYPE_IEEE_802_1AH, "802.1ah Provider Backbone Bridge (mac-in-mac)" },
{ ETHERTYPE_EAPOL, "802.1X Authentication" },
{ ETHERTYPE_RSN_PREAUTH, "802.11i Pre-Authentication" },
{ ETHERTYPE_MPLS, "MPLS label switched packet" },
{ ETHERTYPE_MPLS_MULTI, "MPLS multicast label switched packet" },
{ ETHERTYPE_3C_NBP_DGRAM, "3Com NBP Datagram" },
{ ETHERTYPE_DEC, "DEC proto" },
{ ETHERTYPE_DNA_DL, "DEC DNA Dump/Load" },
{ ETHERTYPE_DNA_RC, "DEC DNA Remote Console" },
{ ETHERTYPE_DNA_RT, "DEC DNA Routing" },
{ ETHERTYPE_LAT, "DEC LAT" },
{ ETHERTYPE_DEC_DIAG, "DEC Diagnostics" },
{ ETHERTYPE_DEC_CUST, "DEC Customer use" },
{ ETHERTYPE_DEC_SCA, "DEC LAVC/SCA" },
{ ETHERTYPE_DEC_LAST, "DEC LAST" },
{ ETHERTYPE_ETHBRIDGE, "Transparent Ethernet bridging" },
{ ETHERTYPE_CGMP, "Cisco Group Management Protocol" },
{ ETHERTYPE_MSRP, "802.1Qat Multiple Stream Reservation Protocol" },
{ ETHERTYPE_AVBTP, "IEEE 1722 Audio Video Bridging Transport Protocol" },
{ ETHERTYPE_GIGAMON, "Gigamon Header" },
{ ETHERTYPE_MAC_CONTROL, "MAC Control" },
{ ETHERTYPE_SLOW_PROTOCOLS, "Slow Protocols" },
{ ETHERTYPE_RTMAC, "Real-Time Media Access Control" },
{ ETHERTYPE_RTCFG, "Real-Time Configuration Protocol" },
{ ETHERTYPE_CDMA2000_A10_UBS, "CDMA2000 A10 Unstructured byte stream" },
{ ETHERTYPE_PROFINET, "PROFINET"},
{ ETHERTYPE_AOE, "ATA over Ethernet" },
{ ETHERTYPE_ECATF, "EtherCAT frame" },
{ ETHERTYPE_TELKONET, "Telkonet powerline" },
{ ETHERTYPE_EPL_V2, "ETHERNET Powerlink v2" },
{ ETHERTYPE_XIMETA, "XiMeta Technology" },
{ ETHERTYPE_CSM_ENCAPS, "CSM_ENCAPS Protocol" },
{ ETHERTYPE_IEEE802_OUI_EXTENDED, "IEEE 802a OUI Extended Ethertype" },
{ ETHERTYPE_IEC61850_GOOSE, "IEC 61850/GOOSE" },
{ ETHERTYPE_IEC61850_GSE, "IEC 61850/GSE management services" },
{ ETHERTYPE_IEC61850_SV, "IEC 61850/SV (Sampled Value Transmission" },
{ ETHERTYPE_TIPC, "Transparent Inter Process Communication" },
{ ETHERTYPE_LLDP, "802.1 Link Layer Discovery Protocol (LLDP)" },
{ ETHERTYPE_3GPP2, "CDMA2000 A10 3GPP2 Packet" },
{ ETHERTYPE_TTE_PCF, "TTEthernet Protocol Control Frame" },
{ ETHERTYPE_LLTD, "Link Layer Topology Discovery (LLTD)" },
{ ETHERTYPE_WSMP, "(WAVE) Short Message Protocol (WSM)" },
{ ETHERTYPE_VMLAB, "VMware Lab Manager" },
{ ETHERTYPE_COBRANET, "Cirrus Cobranet Packet" },
{ ETHERTYPE_NSRP, "Juniper Netscreen Redundant Protocol" },
/*
* NDISWAN on Windows translates Ethernet frames from higher-level
* protocols into PPP frames to hand to the PPP driver, and translates
* PPP frames from the PPP driver to hand to the higher-level protocols.
*
* Apparently the PPP driver, on at least some versions of Windows,
* passes frames for internal-to-PPP protocols up through NDISWAN;
* the protocol type field appears to be passed through unchanged
* (unlike what's done with, for example, the protocol type field
* for IP, which is mapped from its PPP value to its Ethernet value).
*
* This means that we may see, on Ethernet captures, frames for
* protocols internal to PPP, so we list as "Ethernet" protocol
* types the PPP protocol types we've seen.
*/
{ PPP_IPCP, "PPP IP Control Protocol" },
{ PPP_LCP, "PPP Link Control Protocol" },
{ PPP_PAP, "PPP Password Authentication Protocol" },
{ PPP_CCP, "PPP Compression Control Protocol" },
{ ETHERTYPE_LLT, "Veritas Low Latency Transport (not officially registered)" },
{ ETHERTYPE_CFM, "IEEE 802.1ag Connectivity Fault Management (CFM) protocol" },
{ ETHERTYPE_FCOE, "Fibre Channel over Ethernet" },
{ ETHERTYPE_FIP, "FCoE Initialization Protocol" },
{ ETHERTYPE_PTP, "PTPv2 over Ethernet (IEEE1588)" },
{ ETHERTYPE_PRP, "Parallel Redundancy Protocol (IEC62439 Chapter 6)" },
{ ETHERTYPE_FLIP, "Flow Layer Internal Protocol" },
{ ETHERTYPE_TDMOE, "Digium TDM over Ethernet Protocol" },
{ 0, NULL }
};
static void add_dix_trailer(packet_info *pinfo, proto_tree *tree, proto_tree *fh_tree,
int trailer_id, tvbuff_t *tvb, tvbuff_t *next_tvb, int offset_after_etype,
guint length_before, gint fcs_len);
void
capture_ethertype(guint16 etype, const guchar *pd, int offset, int len,
packet_counts *ld)
{
switch (etype) {
case ETHERTYPE_ARP:
ld->arp++;
break;
case ETHERTYPE_IP:
capture_ip(pd, offset, len, ld);
break;
case ETHERTYPE_IPv6:
capture_ipv6(pd, offset, len, ld);
break;
case ETHERTYPE_IPX:
capture_ipx(ld);
break;
case ETHERTYPE_VLAN:
capture_vlan(pd, offset, len, ld);
break;
case ETHERTYPE_IEEE_802_1AD:
case ETHERTYPE_IEEE_802_1AH:
capture_ieee8021ah(pd, offset, len, ld);
break;
case ETHERTYPE_VINES_IP:
case ETHERTYPE_VINES_ECHO:
capture_vines(ld);
break;
default:
ld->other++;
break;
}
}
void
ethertype(guint16 etype, tvbuff_t *tvb, int offset_after_etype,
packet_info *pinfo, proto_tree *tree, proto_tree *fh_tree,
int etype_id, int trailer_id, int fcs_len)
{
const char *description;
tvbuff_t *volatile next_tvb;
guint length_before;
gint captured_length, reported_length;
volatile gboolean dissector_found = FALSE;
const char *volatile saved_proto;
/* Add the Ethernet type to the protocol tree */
if (tree) {
proto_tree_add_uint(fh_tree, etype_id, tvb,
offset_after_etype - 2, 2, etype);
}
/* Get the captured length and reported length of the data
after the Ethernet type. */
captured_length = tvb_length_remaining(tvb, offset_after_etype);
reported_length = tvb_reported_length_remaining(tvb,
offset_after_etype);
/* Remember how much data there is after the Ethernet type,
including any trailer and FCS. */
length_before = reported_length;
/* Construct a tvbuff for the payload after the Ethernet type.
If the FCS length is positive, remove the FCS.
(If it's zero, there's no FCS; if it's negative,
we don't know whether there's an FCS, so we'll
guess based on the length of the trailer.) */
if (fcs_len > 0) {
if (captured_length >= 0 && reported_length >= 0) {
if (reported_length >= fcs_len)
reported_length -= fcs_len;
if (captured_length > reported_length)
captured_length = reported_length;
}
}
next_tvb = tvb_new_subset(tvb, offset_after_etype, captured_length,
reported_length);
pinfo->ethertype = etype;
/* Look for sub-dissector, and call it if found.
Catch exceptions, so that if the reported length of "next_tvb"
was reduced by some dissector before an exception was thrown,
we can still put in an item for the trailer. */
saved_proto = pinfo->current_proto;
TRY {
dissector_found = dissector_try_port(ethertype_dissector_table,
etype, next_tvb, pinfo, tree);
}
CATCH(BoundsError) {
/* Somebody threw BoundsError, which means that:
1) a dissector was found, so we don't need to
dissect the payload as data or update the
protocol or info columns;
2) dissecting the payload found that the packet was
cut off by a snapshot length before the end of
the payload. The trailer comes after the payload,
so *all* of the trailer is cut off, and we'll
just get another BoundsError if we add the trailer.
Therefore, we just rethrow the exception so it gets
reported; we don't dissect the trailer or do anything
else. */
RETHROW;
}
CATCH(OutOfMemoryError) {
RETHROW;
}
CATCH_ALL {
/* Somebody threw an exception other than BoundsError, which
means that a dissector was found, so we don't need to
dissect the payload as data or update the protocol or info
columns. We just show the exception and then drive on
to show the trailer, after noting that a dissector was
found and restoring the protocol value that was in effect
before we called the subdissector. */
show_exception(next_tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);
dissector_found = TRUE;
pinfo->current_proto = saved_proto;
}
ENDTRY;
if (!dissector_found) {
/* No sub-dissector found.
Label rest of packet as "Data" */
call_dissector(data_handle,next_tvb, pinfo, tree);
/* Label protocol */
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "0x%04x",
etype);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
description = match_strval(etype, etype_vals);
if (description) {
col_add_str(pinfo->cinfo, COL_INFO,
description);
}
}
}
add_dix_trailer(pinfo, tree, fh_tree, trailer_id, tvb, next_tvb, offset_after_etype,
length_before, fcs_len);
}
static void
add_dix_trailer(packet_info *pinfo, proto_tree *tree, proto_tree *fh_tree, int trailer_id,
tvbuff_t *tvb, tvbuff_t *next_tvb, int offset_after_etype,
guint length_before, gint fcs_len)
{
guint length;
tvbuff_t *trailer_tvb;
if (fh_tree == NULL)
return; /* we're not building a protocol tree */
/* OK, how much is there in that tvbuff now? */
length = tvb_reported_length(next_tvb);
/* If there's less than there was before, what's left is
a trailer. */
if (length < length_before) {
/*
* Is any of the padding present in the tvbuff?
*/
if (tvb_offset_exists(tvb, offset_after_etype + length)) {
/*
* Yes - create a tvbuff for the padding.
*/
trailer_tvb = tvb_new_subset_remaining(tvb,
offset_after_etype + length);
} else {
/*
* No - don't bother showing the trailer.
* XXX - show a Short Frame indication?
*/
trailer_tvb = NULL;
}
} else
trailer_tvb = NULL; /* no trailer */
add_ethernet_trailer(pinfo, tree, fh_tree, trailer_id, tvb, trailer_tvb, fcs_len);
}
void
proto_register_ethertype(void)
{
/* subdissector code */
ethertype_dissector_table = register_dissector_table("ethertype",
"Ethertype", FT_UINT16, BASE_HEX);
}
void
proto_reg_handoff_ethertype(void)
{
data_handle = find_dissector("data");
}
|