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-- Dissector for Realtek 8152 USB Ethernet adapter
-- TODO interrupt dissection? (register accesses, etc.?)
local r8152 = Proto("r8152", "Realtek 8152")
local eth = Dissector.get("eth_withfcs")
local usb_transfer_type = Field.new("usb.transfer_type")
local usb_direction = Field.new("usb.endpoint_number.direction")
r8152.fields.rx = ProtoField.bool("r8152.rx", "Receive Descriptor")
r8152.fields.tx = ProtoField.bool("r8152.tx", "Transmit Descriptor")
r8152.fields.opts = ProtoField.uint32("r8152.opts", "opts", base.HEX)
r8152.fields.rx_len = ProtoField.uint16("r8152.rx_len", "Receive Length", base.DEC, nil, 0x7fff)
function dissect_rx(tvb, pinfo, tree)
local i
local offset = 0
local opts1_tree = tree:add_le(r8152.fields.opts, tvb(offset, 4))
opts1_tree:add_le(r8152.fields.rx_len, tvb(offset, 4))
offset = offset + 4
for i = 2, 6 do
tree:add_le(r8152.fields.opts, tvb(offset, 4))
offset = offset + 4
end
return offset
end
function dissect_tx(tvb, pinfo, tree)
local i
local offset = 0
for i = 1, 2 do
tree:add_le(r8152.fields.opts, tvb(offset, 4))
offset = offset + 4
end
return offset
end
function r8152.dissector(tvb, pinfo, tree)
local offset
local transfer_type = usb_transfer_type().value
-- direction: OUT (0), IN (1)
local is_rx = usb_direction().value == 1
-- Process only bulk packets
if transfer_type ~= 3 then
return 0
end
pinfo.cols.protocol = r8152.name
local dissect_desc
local r8152_tree = tree:add(r8152, tvb)
local ti
if is_rx then
dissect_desc = dissect_rx
ti = r8152_tree:add(r8152.fields.rx, tvb(0, 24))
else
dissect_desc = dissect_tx
ti = r8152_tree:add(r8152.fields.tx, tvb(0, 8))
end
ti:set_generated(true)
offset = dissect_desc(tvb, pinfo, r8152_tree)
r8152_tree:set_len(offset)
eth(tvb(offset):tvb(), pinfo, tree)
end
function r8152.init()
local usb_product = DissectorTable.get("usb.product");
usb_product:add(0x0bda8153, r8152)
end
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