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
|
/* packet-bat-batman.c
* Routines for B.A.T.M.A.N. Layer 3 dissection
* Copyright 2008, Sven Eckelmann <sven.eckelmann@gmx.de>
*
* $Id$
*
* 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.
*/
#include "packet-bat.h"
#include <epan/addr_resolv.h>
static gint ett_bat_batman = -1;
static gint ett_bat_batman_flags = -1;
static gint ett_bat_batman_gwflags = -1;
static gint ett_bat_batman_hna = -1;
static dissector_handle_t data_handle;
static int hf_bat_batman_version = -1;
static int hf_bat_batman_flags = -1;
static int hf_bat_batman_ttl = -1;
static int hf_bat_batman_gwflags = -1;
static int hf_bat_batman_seqno = -1;
static int hf_bat_batman_gwport = -1;
static int hf_bat_batman_orig = -1;
static int hf_bat_batman_old_orig = -1;
static int hf_bat_batman_tq = -1;
static int hf_bat_batman_hna_len = -1;
static int hf_bat_batman_hna_network = -1;
static int hf_bat_batman_hna_netmask = -1;
/* flags */
static int hf_bat_batman_flags_unidirectional = -1;
static int hf_bat_batman_flags_directlink = -1;
/* gwflags */
/* unknown */
static guint global_bat_batman_udp_port = BAT_BATMAN_PORT;
static guint udp_port = 0;
static void dissect_bat_batman(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void dissect_bat_hna(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
/* supported packet dissectors */
static void dissect_bat_batman_v5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
void register_bat_batman(void)
{
static hf_register_info hf[] = {
{ &hf_bat_batman_version,
{ "Version", "bat.batman.version",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_flags,
{ "Flags", "bat.batman.flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_ttl,
{ "Time to Live", "bat.batman.ttl",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_gwflags,
{ "Gateway Flags", "bat.batman.gwflags",
FT_UINT8, BASE_HEX, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_seqno,
{ "Sequence number", "bat.batman.seq",
FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_gwport,
{ "Gateway Port", "bat.batman.gwport",
FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_orig,
{ "Originator", "bat.batman.orig",
FT_IPv4, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_old_orig,
{ "Received from", "bat.batman.old_orig",
FT_IPv4, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_tq,
{ "Transmission Quality", "bat.batman.tq",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_hna_len,
{ "Number of HNAs", "bat.batman.hna_len",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_flags_unidirectional,
{ "Unidirectional", "bat.batman.flags.unidirectional",
FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x80,
"", HFILL }
},
{ &hf_bat_batman_flags_directlink,
{ "DirectLink", "bat.batman.flags.directlink",
FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x40,
"", HFILL }
},
{ &hf_bat_batman_hna_network,
{ "HNA Network", "bat.batman.hna_network",
FT_IPv4, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{ &hf_bat_batman_hna_netmask,
{ "HNA Netmask", "bat.batman.hna_netmask",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_bat_batman,
&ett_bat_batman_flags,
&ett_bat_batman_gwflags,
&ett_bat_batman_hna
};
proto_register_field_array(proto_bat_plugin, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
prefs_register_uint_preference(bat_module, "batman.bat.port", "BAT UDP Port",
"Set the port for B.A.T.M.A.N. BAT "
"messages (if other than the default of 4305)",
10, &global_bat_batman_udp_port);
}
void reg_handoff_bat_batman(void)
{
static gboolean inited = FALSE;
static dissector_handle_t batman_handle;
if (!inited) {
batman_handle = create_dissector_handle(dissect_bat_batman, proto_bat_plugin);
data_handle = find_dissector("data");
} else {
dissector_delete("udp.port", udp_port, batman_handle);
}
udp_port = global_bat_batman_udp_port;
dissector_add("udp.port", udp_port, batman_handle);
}
static void dissect_bat_batman(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 version;
/* set protocol name */
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_BATMAN");
}
version = tvb_get_guint8(tvb, 0);
switch (version) {
case 5:
dissect_bat_batman_v5(tvb, pinfo, tree);
break;
default:
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
col_append_fstr(pinfo->cinfo, COL_INFO, "Unsupported Version %d", version);
}
call_dissector(data_handle, tvb, pinfo, tree);
break;
}
}
static void dissect_bat_gwflags(tvbuff_t *tvb, guint8 gwflags, int offset, proto_item *tgw)
{
proto_tree *gwflags_tree;
guint8 s = (gwflags & 0x80) >> 7;
guint8 downbits = (gwflags & 0x7C) >> 3;
guint8 upbits = (gwflags & 0x07);
guint down, up;
down = 32 * (s + 2) * (1 << downbits);
up = ((upbits + 1) * down) / 8;
gwflags_tree = proto_item_add_subtree(tgw, ett_bat_batman_gwflags);
proto_tree_add_text(gwflags_tree, tvb, offset, 1, "Download Speed: %dkbit", down);
proto_tree_add_text(gwflags_tree, tvb, offset, 1, "Upload Speed: %dkbit", up);
}
static void dissect_bat_batman_v5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
struct batman_packet_v5 *batman_packeth;
const guint8 *old_orig_addr, *orig_addr;
guint32 old_orig, orig;
gint i;
tvbuff_t *next_tvb;
guint length_remaining;
int offset = 0;
batman_packeth = ep_alloc(sizeof(struct batman_packet_v5));
batman_packeth->version = tvb_get_guint8(tvb, 0);
batman_packeth->flags = tvb_get_guint8(tvb, 1);
batman_packeth->ttl = tvb_get_guint8(tvb, 2);
batman_packeth->gwflags = tvb_get_guint8(tvb, 3);
batman_packeth->seqno = tvb_get_ntohs(tvb, 4);
batman_packeth->gwport = tvb_get_ntohs(tvb, 6);
orig_addr = tvb_get_ptr(tvb, 8, 4);
orig = tvb_get_ipv4(tvb, 8);
SET_ADDRESS(&batman_packeth->orig, AT_IPv4, 4, orig_addr);
old_orig_addr = tvb_get_ptr(tvb, 12, 4);
old_orig = tvb_get_ipv4(tvb, 12);
SET_ADDRESS(&batman_packeth->old_orig, AT_IPv4, 4, old_orig_addr);
batman_packeth->tq = tvb_get_guint8(tvb, 16);
batman_packeth->hna_len = tvb_get_guint8(tvb, 17);
/* Set info column */
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
col_append_fstr(pinfo->cinfo, COL_INFO, "Seq=%u",
batman_packeth->seqno);
}
/* Set tree info */
if (tree) {
proto_item *ti = NULL, *tf, *tgw;
proto_tree *bat_batman_tree = NULL, *flag_tree = NULL;
if (PTREE_DATA(tree)->visible) {
ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, BATMAN_PACKET_V5_SIZE,
"B.A.T.M.A.N., Orig: %s (%s)",
get_hostname(orig), ip_to_str(batman_packeth->orig.data));
} else {
ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, BATMAN_PACKET_V5_SIZE, FALSE);
}
bat_batman_tree = proto_item_add_subtree(ti, ett_bat_batman);
/* items */
proto_tree_add_item(bat_batman_tree, hf_bat_batman_version, tvb, offset, 1, FALSE);
offset += 1;
tf = proto_tree_add_item(bat_batman_tree, hf_bat_batman_flags, tvb, offset, 1, FALSE);
/* <flags> */
flag_tree = proto_item_add_subtree(tf, ett_bat_batman_flags);
proto_tree_add_boolean(flag_tree, hf_bat_batman_flags_unidirectional, tvb, offset, 1, batman_packeth->flags);
proto_tree_add_boolean(flag_tree, hf_bat_batman_flags_directlink, tvb, offset, 1, batman_packeth->flags);
/* </flags> */
offset += 1;
proto_tree_add_item(bat_batman_tree, hf_bat_batman_ttl, tvb, offset, 1, FALSE);
offset += 1;
tgw = proto_tree_add_item(bat_batman_tree, hf_bat_batman_gwflags, tvb, offset, 1, FALSE);
dissect_bat_gwflags(tvb, batman_packeth->gwflags, offset, tgw);
offset += 1;
proto_tree_add_item(bat_batman_tree, hf_bat_batman_seqno, tvb, offset, 2, FALSE);
offset += 2;
proto_tree_add_item(bat_batman_tree, hf_bat_batman_gwport, tvb, offset, 2, FALSE);
offset += 2;
proto_tree_add_ipv4(bat_batman_tree, hf_bat_batman_orig, tvb, offset, 4, orig);
offset += 4;
proto_tree_add_ipv4(bat_batman_tree, hf_bat_batman_old_orig, tvb, offset, 4, old_orig);
offset += 4;
proto_tree_add_item(bat_batman_tree, hf_bat_batman_tq, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(bat_batman_tree, hf_bat_batman_hna_len, tvb, offset, 1, FALSE);
offset += 1;
}
tap_queue_packet(bat_tap, pinfo, batman_packeth);
length_remaining = tvb_length_remaining(tvb, offset);
for (i = 0; i < batman_packeth->hna_len; i++) {
next_tvb = tvb_new_subset(tvb, offset, 5, 5);
if (have_tap_listener(bat_follow_tap)) {
tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
}
dissect_bat_hna(next_tvb, pinfo, tree);
offset += 5;
}
length_remaining = tvb_length_remaining(tvb, offset);
if (length_remaining != 0) {
next_tvb = tvb_new_subset(tvb, offset, length_remaining, length_remaining);
if (have_tap_listener(bat_follow_tap)) {
tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
}
call_dissector(data_handle, next_tvb, pinfo, tree);
}
}
static void dissect_bat_hna(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
{
const guint8 *hna_addr;
guint32 hna;
guint8 hna_netmask;
hna_addr = tvb_get_ptr(tvb, 0, 4);
hna = tvb_get_ipv4(tvb, 0);
hna_netmask = tvb_get_guint8(tvb, 4);
/* Set tree info */
if (tree) {
proto_item *ti = NULL;
proto_tree *bat_batman_hna_tree = NULL;
if (PTREE_DATA(tree)->visible) {
ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 5,
"B.A.T.M.A.N. HNA: %s/%d",
ip_to_str(hna_addr), hna_netmask);
} else {
ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 5, FALSE);
}
bat_batman_hna_tree = proto_item_add_subtree(ti, ett_bat_batman_hna);
proto_tree_add_ipv4(bat_batman_hna_tree, hf_bat_batman_hna_network, tvb, 0, 4, hna);
proto_tree_add_item(bat_batman_hna_tree, hf_bat_batman_hna_netmask, tvb, 4, 1, FALSE);
}
}
|
