Osmocom's Base Station Controller for 2G mobile networks https://osmocom.org/projects/osmobsc
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osmo-bsc/contrib/gprs/gprs-buffer-count.lua

80 lines
2.0 KiB

-- I count the buffer space needed for LLC PDUs in the worse case and print it
do
local function init_listener()
-- handle the port as NS over IP
local udp_port_table = DissectorTable.get("udp.port")
local gprs_ns_dis = Dissector.get("gprs_ns")
udp_port_table:add(23000,gprs_ns_dis)
-- bssgp filters
local bssgp_pdu_get = Field.new("bssgp.pdu_type")
local bssgp_delay_get = Field.new("bssgp.delay_val")
local llcgprs_get = Field.new("llcgprs")
local pdus = nil
print("START...")
local tap = Listener.new("ip", "udp.port == 23000 && bssgp.pdu_type == 0")
function tap.packet(pinfo,tvb,ip)
local pdu = bssgp_pdu_get()
local len = llcgprs_get().len
local delay = bssgp_delay_get()
-- only handle bssgp, but we also want the IP frame
if not pdu then
return
end
if tonumber(tostring(delay)) == 65535 then
pdus = { next = pdus,
len = len,
expires = -1 }
else
local off = tonumber(tostring(delay)) / 100.0
pdus = { next = pdus,
len = len,
expires = pinfo.rel_ts + off }
end
local now_time = tonumber(tostring(pinfo.rel_ts))
local now_size = 0
local l = pdus
local prev = nil
local count = 0
while l do
if now_time < l.expires or l.expires == -1 then
now_size = now_size + l.len
prev = l
l = l.next
count = count + 1
else
-- delete things
if prev == nil then
pdus = nil
l = nil
else
prev.next = l.next
l = l.next
end
end
end
-- print("TOTAL: " .. now_time .. " PDU_SIZE: " .. now_size)
print(now_time .. " " .. now_size / 1024.0 .. " " .. count)
-- print("NOW: " .. tostring(pinfo.rel_ts) .. " Delay: " .. tostring(delay) .. " Length: " .. tostring(len))
end
function tap.draw()
-- well... this will not be called...
-- for ip,bssgp_histo in pairs(dumpers) do
-- print("IP " .. ip)
-- end
print("END")
end
function tap.reset()
-- well... this will not be called...
end
end
init_listener()
end