hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
38 lines
1.5 KiB
Lua
38 lines
1.5 KiB
Lua
#!/usr/bin/env bcc-lua
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--[[
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Copyright 2016 Marek Vavrusa <mvavrusa@cloudflare.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]
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-- This program counts total bytes received per-protocol in 64-bit counters.
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-- The map backend is array in this case to avoid key allocations.
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-- increments counter for each packet of given type seen
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-- Rewrite of https://github.com/torvalds/linux/blob/master/samples/bpf/sock_example.c
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local ffi = require("ffi")
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local bpf = require("bpf")
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local S = require("syscall")
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-- Shared part of the program
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local map = bpf.map('array', 256, ffi.typeof('uint32_t'), ffi.typeof('uint64_t'))
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-- Kernel-space part of the program
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bpf.socket('lo', function (skb)
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local proto = pkt.ip.proto -- Get byte (ip.proto) from frame at [23]
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xadd(map[proto], skb.len) -- Atomic `map[proto] += <payload length>`
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end)
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-- User-space part of the program
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for _ = 1, 10 do
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local icmp, udp, tcp = map[1], map[17], map[6]
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print(string.format('TCP %d UDP %d ICMP %d bytes',
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tonumber(tcp or 0), tonumber(udp or 0), tonumber(icmp or 0)))
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S.sleep(1)
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end |