forked from ainoniwa/bmp-dissector
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathbmp.lua
401 lines (324 loc) · 14.3 KB
/
bmp.lua
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
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
-- #################################################
-- BGP Monitoring protocol dissector
-- Refer:
-- https://tools.ietf.org/id/draft-ietf-grow-bmp-07.txt
-- #################################################
-- =================================================
-- BGP Monitoring Protocol
-- =================================================
bmp_proto = Proto("bmp","BGP Monitoring Protocol")
-- =================================
-- Util
-- =================================
local VALS_BOOL = {[0] = "False", [1] = "True"}
BMPReader = {}
BMPReader.new = function(buf, offset)
local self = {}
offset = offset or 0
self.read = function(length)
local r = buf(offset, length)
offset = offset + length
return r
end
self.read_all = function()
local r = buf(offset, buf:len() - offset)
offset = buf:len()
return r
end
self.skip = function(length)
offset = offset + length
end
self.is_tail = function()
if offset >= buf:len() then
return true
else
return false
end
end
return self
end
-- =================================
-- 4. BMP Message Format
-- =================================
fields = {}
-- 4.1. Common Header
fields['bmp.version'] = ProtoField.uint8("bmp.version", "Version", base.HEX)
fields['bmp.length'] = ProtoField.uint32("bmp.length", "Length")
fields['bmp.type'] = ProtoField.uint8("bmp.type", "Type", base.HEX)
-- 4.2. Per-Peer Header
fields['bmp.peer.type'] = ProtoField.uint8("bmp.peer.type", "Peer Type", base.HEX)
fields['bmp.peer.flags'] = ProtoField.uint8("bmp.peer.flags", "Peer Flags", base.HEX)
fields['bmp.peer.flags.v'] = ProtoField.uint8("bmp.peer.flags", "address type", base.HEX, VALS_BOOL, 0x80)
fields['bmp.peer.flags.l'] = ProtoField.uint8("bmp.peer.flags", "policy", base.HEX, VALS_BOOL, 0x40)
fields['bmp.peer.dist'] = ProtoField.uint64("bmp.peer.dist", "Peer Distinguisher")
fields['bmp.peer.addr_v4'] = ProtoField.ipv4("bmp.peer.addr", "Peer address")
fields['bmp.peer.addr_v6'] = ProtoField.ipv6("bmp.peer.addr", "Peer address")
fields['bmp.peer.as'] = ProtoField.uint64("bmp.peer.as", "Peer AS")
fields['bmp.peer.id'] = ProtoField.ipv4("bmp.peer.id", "Peer BGP ID")
fields['bmp.peer.ts_sec'] = ProtoField.uint64("bmp.peer.ts_sec", "Timestamp[sec]")
fields['bmp.peer.ts_msec'] = ProtoField.uint64("bmp.peer.ts_msec", "Timestamp[msec]")
-- 4.3. Initiation Message
fields['bmp.init.type'] = ProtoField.uint16("bmp.init.type", "Information type")
fields['bmp.init.length'] = ProtoField.uint16("bmp.init.length", "Length")
fields['bmp.init.info'] = ProtoField.string("bmp.init.info", "Information")
-- 4.4. Termination Message
fields['bmp.termination.type'] = ProtoField.uint16("bmp.termination.type", "Termination type")
fields['bmp.termination.length'] = ProtoField.uint16("bmp.termination.length", "Length")
fields['bmp.termination.reason'] = ProtoField.uint16("bmp.termination.reason", "Reason")
fields['bmp.termination.info'] = ProtoField.string("bmp.termination.info", "Information")
-- 4.5. Route Monitoring
-- None.
-- 4.6. Stats Reports
fields['bmp.stat.count'] = ProtoField.uint32("bmp.stat.count", "Stat count")
fields['bmp.stat.type'] = ProtoField.uint16("bmp.stat.type", "Stat type")
fields['bmp.stat.length'] = ProtoField.uint16("bmp.stat.length", "Stat length")
fields['bmp.stat.data32'] = ProtoField.uint32("bmp.stat.data", "Stat data")
fields['bmp.stat.data64'] = ProtoField.uint64("bmp.stat.data", "Stat data")
-- 4.7. Peer Down Notification
fields['bmp.peer_down.reason'] = ProtoField.uint8("bmp.peer_down.reason", "Reason")
-- 4.8. Peer Up Notification
fields['bmp.peer_up.local_addr_v4'] = ProtoField.ipv4("bmp.peer_up.local_addr", "Local address")
fields['bmp.peer_up.local_addr_v6'] = ProtoField.ipv6("bmp.peer_up.local_addr", "Local address")
fields['bmp.peer_up.local_port'] = ProtoField.uint16("bmp.peer_up.local_port", "Local Port")
fields['bmp.peer_up.remote_port'] = ProtoField.uint16("bmp.peer_up.remote_port", "Peer Port")
-- Register protocol fields
for i, v in pairs(fields) do table.insert(bmp_proto.fields, v) end
bmp_type = {
[0] = "Route Monitoring",
[1] = "Statistics Report",
[2] = "Peer Down Notification",
[3] = "Peer Up Notification",
[4] = "Initiation Message",
[5] = "Termination Message",
}
peer_type = {
[0] = "Global Instance Peer",
[1] = "L3 VPN Instance Peer",
}
peer_flags_v = {
[0] = "IPv4",
[1] = "IPv6",
}
peer_flags_l = {
[0] = "pre-policy Adj-RIB-In",
[1] = "post-policy Adj-RIB-In",
}
information_type = {
[0] = "String",
[1] = "sysDescr",
[2] = "sysName",
}
termination_type = {
[0] = "String",
[1] = "Reason",
}
termination_reason = {
[0] = "Session administratively closed",
[1] = "Unspecified reason",
[2] = "Out of resources",
[3] = "Redundant connection",
}
stat_type = {
[0] = "Number of prefixes rejected by inbound policy",
[1] = "Number of (known) duplicate prefix advertisements",
[2] = "Number of (known) duplicate withdraws",
[3] = "Number of updates invalidated due to CLUSTER_LIST loop",
[4] = "Number of updates invalidated due to AS_PATH loop",
[5] = "Number of updates invalidated due to ORIGINATOR_ID",
[6] = "Number of updates invalidated due to AS_CONFED loop",
[7] = "Number of routes in Adj-RIBs-In",
[8] = "Number of routes in Loc-RIB",
}
-- ---------------------------------
-- 4.1. Common Header
-- ---------------------------------
function bmp_proto.dissector(buf, pinfo, tree)
local offset = 0
local info = {}
while offset < buf:len() do
local _version_range = buf(offset,1)
local _length_range = buf(offset+1,4)
local _type_range = buf(offset+5,1)
local _version = _version_range:uint()
local _length = _length_range:uint()
local _type = _type_range:uint()
if offset + _length > buf:len() then
pinfo.can_desegment = 1
pinfo.desegment_len = offset + _length - buf:len()
pinfo.desegment_offset = 0
return
end
local bmp_tree = tree:add(bmp_proto, buf(offset, _length))
bmp_tree:set_text("BGP Monitoring Protocol, Type: " .. bmp_type[_type])
bmp_tree:add(fields['bmp.version'], _version_range)
bmp_tree:add(fields['bmp.length'], _length_range)
bmp_tree:add(fields['bmp.type'], _type_range):append_text(" (" .. bmp_type[_type] .. ")")
local reader = BMPReader.new(buf(offset, _length))
reader.skip(6)
offset = offset + _length
if bmp_type[_type] == "Route Monitoring" then
table.insert(info, "Route Monitoring")
bmp_route_monitoring(reader, pinfo, bmp_tree)
elseif bmp_type[_type] == "Statistics Report" then
table.insert(info, "Statistics Report")
bmp_statistics(reader, pinfo, bmp_tree)
elseif bmp_type[_type] == "Peer Down Notification" then
table.insert(info, "Peer Down Notification")
bmp_peer_down(reader, pinfo, bmp_tree)
elseif bmp_type[_type] == "Peer Up Notification" then
table.insert(info, "Peer Up Notification")
bmp_peer_up(reader, pinfo, bmp_tree)
elseif bmp_type[_type] == "Initiation Message" then
table.insert(info, "Initiation Message")
bmp_init(reader, pinfo, bmp_tree)
elseif bmp_type[_type] == "Termination Message" then
table.insert(info, "Termination Message")
bmp_termination(reader, pinfo, bmp_tree)
end
end
pinfo.cols.protocol = "BMP"
pinfo.cols.info = table.concat(info, ", ")
end
-- ---------------------------------
-- 4.2. Per-Peer Header
-- ---------------------------------
function bmp_peer(reader, pinfo, tree)
local _type_range = reader.read(1)
local _type = _type_range:uint()
tree:add(fields['bmp.peer.type'], _type_range):append_text(" (" .. peer_type[_type] .. ")")
local _flags_range = reader.read(1)
local _flags_v = _flags_range:bitfield(0,1)
local _flags_l = _flags_range:bitfield(1,1)
flags_tree = tree:add(fields['bmp.peer.flags'], _flags_range)
flags_tree:add(fields['bmp.peer.flags.v'], _flags_range):append_text(" (" .. peer_flags_v[_flags_v] .. ")")
flags_tree:add(fields['bmp.peer.flags.l'], _flags_range):append_text(" (" .. peer_flags_l[_flags_l] .. ")")
tree:add(fields['bmp.peer.dist'], reader.read(8))
if peer_flags_v[_flags_v] == "IPv4" then
reader.skip(12)
tree:add(fields['bmp.peer.addr_v4'], reader.read(4))
else
tree:add(fields['bmp.peer.addr_v6'], reader.read(16))
end
tree:add(fields['bmp.peer.as'], reader.read(4))
tree:add(fields['bmp.peer.id'], reader.read(4))
tree:add(fields['bmp.peer.ts_sec'], reader.read(4))
tree:add(fields['bmp.peer.ts_msec'], reader.read(4))
return _flags_v
end
-- ---------------------------------
-- 4.3. Initiation Message
-- ---------------------------------
function bmp_init(reader, pinfo, tree)
while not reader.is_tail() do
local _type_range = reader.read(2)
local _length_range = reader.read(2)
local _type = _type_range:uint()
local _length = _length_range:uint()
tree:add(fields['bmp.init.type'], _type_range):append_text(" (" .. information_type[_type] .. ")")
tree:add(fields['bmp.init.length'], _length_range)
if information_type[_type] == "String" then
tree:add(fields['bmp.init.info'], reader.read(_length))
elseif information_type[_type] == "sysDescr" then
tree:add(fields['bmp.init.info'], reader.read(_length))
elseif information_type[_type] == "sysName" then
tree:add(fields['bmp.init.info'], reader.read(_length))
end
end
end
-- ---------------------------------
-- 4.4. Termination Message
-- ---------------------------------
function bmp_termination(reader, pinfo, tree)
while not reader.is_tail() do
local _type_range = reader.read(2)
local _length_range = reader.read(2)
local _type = _type_range:uint()
local _length = _length_range:uint()
tree:add(fields['bmp.termination.type'], _type_range):append_text(" (" .. termination_type[_type] .. ")")
tree:add(fields['bmp.termination.length'], _length_range)
if termination_type[_type] == "Reason" then
local _reason_range = reader.read(_length)
local _reason = _type_range:uint()
tree:add(fields['bmp.termination.reason'], _reason_range):append_text(" (" .. termination_reason[_reason] .. ")")
elseif termination_type[_type] == "String" then
tree:add(fields['bmp.termination.info'], reader.read(_length))
end
end
end
-- ---------------------------------
-- 4.5. Route Monitoring
-- ---------------------------------
function bmp_route_monitoring(reader, pinfo, tree)
bmp_peer(reader, pinfo, tree)
bgp = DissectorTable.get("tcp.port"):get_dissector("179")
bgp:call(reader.read_all():tvb(), pinfo, tree)
end
-- ---------------------------------
-- 4.6. Stats Reports
-- ---------------------------------
function bmp_statistics(reader, pinfo, tree)
bmp_peer(reader, pinfo, tree)
local _count_range = reader.read(4)
local _count = _count_range:uint()
tree:add(fields['bmp.stat.count'], _count_range)
for i=1, _count do
local _type_range = reader.read(2)
local _length_range = reader.read(2)
local _type = _type_range:uint()
local _length = _length_range:uint()
tree:add(fields['bmp.stat.type'], _type_range):append_text(" (" .. stat_type[_type] .. ")")
tree:add(fields['bmp.stat.length'], _length_range)
if stat_type[_type] == "Number of prefixes rejected by inbound policy" then
tree:add(fields['bmp.stat.data32'], reader.read(4))
elseif stat_type[_type] == "Number of (known) duplicate prefix advertisements" then
tree:add(fields['bmp.stat.data32'], reader.read(4))
elseif stat_type[_type] == "Number of (known) duplicate withdraws" then
tree:add(fields['bmp.stat.data32'], reader.read(4))
elseif stat_type[_type] == "Number of updates invalidated due to CLUSTER_LIST loop" then
tree:add(fields['bmp.stat.data32'], reader.read(4))
elseif stat_type[_type] == "Number of updates invalidated due to AS_PATH loop" then
tree:add(fields['bmp.stat.data32'], reader.read(4))
elseif stat_type[_type] == "Number of updates invalidated due to ORIGINATOR_ID" then
tree:add(fields['bmp.stat.data32'], reader.read(4))
elseif stat_type[_type] == "Number of updates invalidated due to AS_CONFED loop" then
tree:add(fields['bmp.stat.data32'], reader.read(4))
elseif stat_type[_type] == "Number of routes in Adj-RIBs-In" then
tree:add(fields['bmp.stat.data64'], reader.read(8))
elseif stat_type[_type] == "Number of routes in Loc-RIB" then
tree:add(fields['bmp.stat.data64'], reader.read(8))
end
end
end
-- ---------------------------------
-- 4.7. Peer Down Notification
-- ---------------------------------
function bmp_peer_down(reader, pinfo, tree)
local _flags_v = bmp_peer(reader, pinfo, tree)
local _reason_range = reader.read(1)
local _reason = _reason_range:uint()
tree:add(fields['bmp.peer_down.reason'], _reason_range)
if _reason < 4 then
bgp = DissectorTable.get("tcp.port"):get_dissector("179")
bgp:call(reader.read_all():tvb(), pinfo, tree)
end
end
-- ---------------------------------
-- 4.8. Peer Up Notification
-- ---------------------------------
function bmp_peer_up(reader, pinfo, tree)
local _flags_v = bmp_peer(reader, pinfo, tree)
if peer_flags_v[_flags_v] == "IPv4" then
reader.skip(12)
tree:add(fields['bmp.peer_up.local_addr_v4'], reader.read(4))
else
tree:add(fields['bmp.peer_up.local_addr_v6'], reader.read(16))
end
tree:add(fields['bmp.peer_up.local_port'], reader.read(2))
tree:add(fields['bmp.peer_up.remote_port'], reader.read(2))
bgp = DissectorTable.get("tcp.port"):get_dissector("179")
bgp:call(reader.read_all():tvb(), pinfo, tree)
end
-- =================================================
-- Register bmp_proto
-- =================================================
DissectorTable.get("tcp.port"):add(11019, bmp_proto)