2 p_nsdp = Proto("nsdp", "Netgear Switch Description Protocol")
4 local f_version = ProtoField.uint8("nsdp.version", "Version", base.DEC)
5 local f_code = ProtoField.uint8("nsdp.code", "Operation Code", base.DEC)
6 local f_error = ProtoField.uint8("nsdp.error", "Error Code", base.DEC)
7 local f_errattr = ProtoField.uint16("nsdp.errattr", "Erroneous Attribute", base.HEX)
8 local f_clientmac = ProtoField.ether("nsdp.clientmac", "Client MAC")
9 local f_switchmac = ProtoField.ether("nsdp.switchmac", "Switch MAC")
10 local f_seqnum = ProtoField.uint32("nsdp.seqnum", "Sequence Number", base.DEC)
27 [3] = "Write Request",
36 [5] = "Invalid Value",
41 local status_codes = {
49 local bitrates_codes = {
65 local vlan_type_codes = {
68 [2] = "port advanced",
70 [4] = "802.1Q advanced"
74 local qos_type_codes = {
90 local function dissect_port_statistics(buffer, offset, subtree)
91 subtree:add(buffer(offset + 4, 1), string.format("Port: %i", buffer(offset + 4, 1):uint()))
92 subtree:add(buffer(offset + 4 + 1 + 8 * 0, 8), "Received:", tostring(buffer(offset + 4 + 1 + 8 * 0, 8):uint64()))
93 subtree:add(buffer(offset + 4 + 1 + 8 * 1, 8), "Sent: ", tostring(buffer(offset + 4 + 1 + 8 * 1, 8):uint64()))
94 subtree:add(buffer(offset + 4 + 1 + 8 * 5, 8), "CRC Errors:", tostring(buffer(offset + 4 + 1 + 8 * 5, 8):uint64()))
98 local function dissect_port_status(buffer, offset, subtree)
99 local st = buffer(offset + 5, 1):uint()
100 subtree:add(buffer(offset + 4, 1), string.format("Port: %i", buffer(offset + 4, 1):uint()))
101 subtree:add(buffer(offset + 5, 1), string.format("Status: %i (%s)", st, status_codes[st] or "unk"))
105 local function dissect_qos_type(buffer, offset, subtree)
106 local t = buffer(offset + 4, 1):uint()
107 subtree:add(buffer(offset + 4, 1), string.format("QoS Type: %i (%s)", t, qos_type_codes[t] or "unk"))
111 local function dissect_qos_config(buffer, offset, subtree)
112 local p = buffer(offset + 5, 1):uint()
113 subtree:add(buffer(offset + 4, 1), string.format("Port: %i", buffer(offset + 4, 1):uint()))
114 subtree:add(buffer(offset + 5, 1), string.format("Priority: %i (%s)", p, prio_codes[p] or "unk"))
118 local function dissect_bitrate(buffer, offset, subtree)
119 local sp = buffer(offset + 5, 4):uint()
120 subtree:add(buffer(offset + 4, 1), string.format("Port: %i", buffer(offset + 4, 1):uint()))
121 subtree:add(buffer(offset + 5, 4), string.format("Speed: %i (%s)", sp, bitrates_codes[sp] or "unk"))
125 local function dissect_vlan_type(buffer, offset, subtree)
126 local vt = buffer(offset + 4, 1):uint()
127 subtree:add(buffer(offset + 4, 1), string.format("VLAN Type: %i (%s)", vt, vlan_type_codes[vt] or "unk"))
131 local function parse_ports(val)
135 if (val % 2 == 1) then
136 ports = ports..i.." "
138 val = math.floor(val / 2)
145 local function dissect_vlan_port_conf(buffer, offset, subtree)
146 subtree:add(buffer(offset + 4, 2), string.format("VLAN: %u", buffer(offset + 4, 2):uint()))
148 if (buffer(offset + 2, 2):uint() >= 3) then
149 subtree:add(buffer(offset + 6, 1), "Ports:", parse_ports(buffer(offset + 6, 1):uint()))
154 local function dissect_vlan_8021q_conf(buffer, offset, subtree)
155 subtree:add(buffer(offset + 4, 2), string.format("VLAN: %u", buffer(offset + 4, 2):uint()))
157 if (buffer(offset + 2, 2):uint() >= 4) then
158 subtree:add(buffer(offset + 6, 1), "Ports:", parse_ports(buffer(offset + 6, 1):uint()))
159 subtree:add(buffer(offset + 7, 1), "Tagged Ports:", parse_ports(buffer(offset + 7, 1):uint()))
164 local function dissect_vlan_pvid(buffer, offset, subtree)
165 subtree:add(buffer(offset + 4, 1), string.format("Port: %i", buffer(offset + 4, 1):uint()))
166 subtree:add(buffer(offset + 5, 2), string.format("VLAN: %u", buffer(offset + 5, 2):uint()))
170 local function dissect_mirror(buffer, offset, subtree)
171 local op = buffer(offset + 4, 1):uint()
174 subtree:add(buffer(offset + 4, 1), "Disabled")
176 subtree:add(buffer(offset + 4, 1), "Output Port:", op)
177 subtree:add(buffer(offset + 6, 1), "Ports:", parse_ports(buffer(offset + 6, 1):uint()))
182 local function dissect_igmp_enablevlan(buffer, offset, subtree)
183 subtree:add(buffer(offset + 4, 2), string.format("Enable: %u", buffer(offset + 4, 2):uint()))
184 subtree:add(buffer(offset + 6, 2), string.format("VLAN: %u", buffer(offset + 6, 2):uint()))
189 [0x0001] = {name = "Product", dissect = "string"},
190 [0x0003] = {name = "Name", dissect = "string"},
191 [0x0004] = {name = "MAC", dissect = "ether"},
192 [0x0006] = {name = "IP", dissect = "ipv4"},
193 [0x0007] = {name = "Mask", dissect = "ipv4"},
194 [0x0008] = {name = "Gateway", dissect = "ipv4"},
195 [0x0009] = {name = "New Password", dissect = "string"},
196 [0x000A] = {name = "Password", dissect = "string"},
197 [0x000B] = {name = "DHCP", dissect = "uint"},
198 [0x000D] = {name = "Firmware Version", dissect = "string"},
199 [0x0010] = {name = "Firmware Upgrade", dissect = "uint"},
200 [0x0013] = {name = "Restart", dissect = "uint"},
201 [0x0014] = {name = "Encrypt Passwords", dissect = "uint"},
202 [0x0400] = {name = "Defaults", dissect = "uint"},
203 [0x0C00] = {name = "Port Status", dissect = dissect_port_status},
204 [0x1000] = {name = "Port Statistics", dissect = dissect_port_statistics},
205 [0x1400] = {name = "Reset Ports Statistics", dissect = "uint"},
206 [0x1800] = {name = "Cabletest Do", dissect = nill},
207 [0x1C00] = {name = "Cabletest Result", dissect = nill},
208 [0x2000] = {name = "VLAN Type", dissect=dissect_vlan_type},
209 [0x2400] = {name = "VLAN Port Conf", dissect=dissect_vlan_port_conf},
210 [0x2800] = {name = "VLAN 802.1Q Conf", dissect=dissect_vlan_8021q_conf},
211 [0x2C00] = {name = "Destroy VLAN", dissect = "uint"},
212 [0x3000] = {name = "VLAN PVID", dissect = dissect_vlan_pvid},
213 [0x3400] = {name = "QoS Type", dissect = dissect_qos_type},
214 [0x3800] = {name = "QoS Config", dissect = dissect_qos_config},
215 [0x4C00] = {name = "Input Bitrate", dissect = dissect_bitrate},
216 [0x5000] = {name = "Output Bitrate", dissect = dissect_bitrate},
217 [0x5400] = {name = "Broadcast Filtering State", dissect = "uint"},
218 [0x5800] = {name = "Broadcast Filtering Bitrate", dissect = dissect_bitrate},
219 [0x5C00] = {name = "Mirror", dissect = dissect_mirror},
220 [0x6000] = {name = "Ports Count", dissect = "uint"},
221 [0x6400] = {name = "Max 802.1Q VLAN Group", dissect = nill},
222 [0x6800] = {name = "IGMP Enable & VLAN", dissect = dissect_igmp_enablevlan},
223 [0x6C00] = {name = "Block Unknown IGMP Addresses", dissect = "uint"},
224 [0x7000] = {name = "Validate IGMPv3 Headers", dissect = "uint"},
225 [0x7400] = {name = "TLV Bitmap", dissect = nill},
226 [0xFFFF] = {name = "End", dissect = nill}
231 local function dissect_header(buffer, subtree)
232 subtree:add(f_version, buffer(0, 1))
233 subtree:add(f_code, buffer(1, 1)):append_text(" ("..(op_codes[buffer(1, 1):uint()] or "unknown")..")")
235 local errcode = buffer(2, 1):uint()
236 local errattr = buffer(4, 2):uint()
237 subtree:add(f_error, buffer(2, 1)):append_text(" ("..(error_codes[errcode] or "unknown")..")")
239 -- add the erroneous attribute only if an error occurred
240 if (errattr ~= 0) then
241 local atf = attributes[errattr]
242 subtree:add(f_errattr, buffer(4, 2)):append_text(" ("..(atf and atf.name or "unk")..")")
245 subtree:add(f_clientmac, buffer(8, 6))
246 subtree:add(f_switchmac, buffer(14, 6))
247 subtree:add(f_seqnum, buffer(20, 4))
251 local function dissect_attributes(buffer, subtree)
254 while (offset < buffer:len()) do
255 if (offset + 4 > buffer:len()) then
256 -- no room for an attribute header, it is an error
257 subtree:add(buffer(offset), "Junk"):set_expert_flags(PI_MALFORMED, PI_ERROR)
261 local code = buffer(offset, 2):uint()
262 local len = buffer(offset + 2, 2):uint()
263 local atf = attributes[code]
265 local attr = subtree:add(buffer(offset, math.min(4 + len, buffer:len() - offset)), string.format("Attribute: 0x%04X (%s)", code, atf and atf.name or "unk"))
266 attr:add(buffer(offset, 2), string.format("Code: 0x%04X", code))
267 attr:add(buffer(offset + 2, 2), string.format("Length: %u", len))
269 if (offset + 4 + len > buffer:len()) then
270 -- attribute length is bigger than remaining packet size, it is an error
271 attr:append_text(" [malformed]")
272 attr:set_expert_flags(PI_MALFORMED, PI_ERROR)
278 -- no data, display nothing
279 elseif (atf == nil or atf.dissect == nil) then
280 -- unknown attribute, display raw bytes
281 attr:add(buffer(offset + 4, len), "Data:", tostring(buffer(offset + 4, len):bytes()))
282 elseif (type(atf.dissect) == "function" ) then
283 -- custom sub-dissector for complex type
284 atf.dissect(buffer, offset, attr)
286 -- simple type, directly show it
287 local func = assert(loadstring("return function(buffer, offset, len) return tostring(buffer(offset + 4, len):"..atf.dissect.."()) end"))() -- ugly, isn't it ?
288 attr:add(buffer(offset + 4, len), atf.name..":", func(buffer, offset, len))
291 offset = offset + 4 + len
296 function p_nsdp.dissector(buffer, pinfo, tree)
297 pinfo.cols.protocol = p_nsdp.name
298 local subtree = tree:add(p_nsdp, buffer())
300 -- stop if the packet is too small to be valid
301 if (buffer:len() < 32) then
305 dissect_header(buffer, subtree)
307 -- stop if it is just a header
308 if (buffer:len() == 32) then
312 local attr_list = subtree:add(buffer(32), "Attributes list")
313 dissect_attributes(buffer, attr_list)
317 function p_nsdp.init ()
321 local udp_dissector_table = DissectorTable.get("udp.port")
322 udp_dissector_table:add(63322, p_nsdp)
323 udp_dissector_table:add(63321, p_nsdp)