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| 1 | +use aya::{ |
| 2 | + Ebpf, |
| 3 | + maps::{ |
| 4 | + Map, MapData, |
| 5 | + perf::{PerfEventArray, PerfEventArrayBuffer}, |
| 6 | + }, |
| 7 | + programs::{KProbe, SchedClassifier, TcAttachType, tc::SchedClassifierLinkId}, |
| 8 | + util::online_cpus, |
| 9 | +}; |
| 10 | + |
| 11 | +use aya_log::EbpfLogger; |
| 12 | +use bytes::BytesMut; |
| 13 | +use std::{ |
| 14 | + convert::TryInto, |
| 15 | + env, fs, |
| 16 | + net::Ipv4Addr, |
| 17 | + path::Path, |
| 18 | + sync::{ |
| 19 | + Arc, Mutex, |
| 20 | + atomic::{AtomicBool, Ordering}, |
| 21 | + }, |
| 22 | +}; |
| 23 | + |
| 24 | +use anyhow::{Context, Ok}; |
| 25 | +use tokio::{signal, sync::broadcast::error}; |
| 26 | +use tracing::{error, info, warn}; |
| 27 | +use tracing_subscriber::{EnvFilter, fmt::format::FmtSpan}; |
| 28 | + |
| 29 | +const BPF_PATH: &str = "BPF_PATH"; //BPF env path |
| 30 | +use std::collections::HashMap; |
| 31 | + |
| 32 | +#[repr(C)] |
| 33 | +#[derive(Clone, Copy)] |
| 34 | +struct NetworkMetrics { |
| 35 | + src_addr: u32, |
| 36 | +} |
| 37 | + |
| 38 | +#[tokio::main] |
| 39 | +async fn main() -> Result<(), anyhow::Error> { |
| 40 | + //init tracing subscriber |
| 41 | + tracing_subscriber::fmt() |
| 42 | + .with_max_level(tracing::Level::INFO) |
| 43 | + .with_target(false) |
| 44 | + .with_level(true) |
| 45 | + .with_span_events(FmtSpan::NONE) |
| 46 | + .with_file(false) |
| 47 | + .pretty() |
| 48 | + .with_env_filter(EnvFilter::new("info")) |
| 49 | + .with_line_number(false) |
| 50 | + .init(); |
| 51 | + |
| 52 | + info!("Starting metrics service..."); |
| 53 | + info!("fetching data"); |
| 54 | + |
| 55 | + let bpf_path = env::var(BPF_PATH).context("BPF_PATH environment variable required")?; |
| 56 | + let data = fs::read(Path::new(&bpf_path)).context("Failed to load file from path")?; |
| 57 | + let mut bpf = Ebpf::load(&data)?; |
| 58 | + //init bpf logger |
| 59 | + info!("Running Ebpf logger"); |
| 60 | + info!("loading programs"); |
| 61 | + let net_metrics_map = bpf |
| 62 | + .take_map("net_metrics") |
| 63 | + .ok_or_else(|| anyhow::anyhow!("net_metrics map not found"))?; |
| 64 | + |
| 65 | + let program: &mut KProbe = bpf |
| 66 | + .program_mut("metrics_tracer") |
| 67 | + .ok_or_else(|| anyhow::anyhow!("program 'metrics_tracer' not found"))? |
| 68 | + .try_into() |
| 69 | + .context("Failed to init Kprobe program")?; |
| 70 | + |
| 71 | + program |
| 72 | + .load() |
| 73 | + .context("Failed to load metrics_tracer program")?; |
| 74 | + |
| 75 | + match program.attach("tcp_identify_packet_loss", 0) { |
| 76 | + std::result::Result::Ok(_) => { |
| 77 | + info!("program attacched successfully to the tcp_identify_packet_loss kprobe ") |
| 78 | + } |
| 79 | + Err(e) => error!( |
| 80 | + "An error occured while attaching the program to the tcp_identify_packet_loss kprobe. {:?} ", |
| 81 | + e |
| 82 | + ), |
| 83 | + } |
| 84 | + let mut net_perf_buffer: Vec<PerfEventArrayBuffer<MapData>> = Vec::new(); |
| 85 | + let mut net_perf_array: PerfEventArray<MapData> = PerfEventArray::try_from(net_metrics_map)?; |
| 86 | + |
| 87 | + for cpu_id in online_cpus().map_err(|e| anyhow::anyhow!("Error {:?}", e))? { |
| 88 | + let buf: PerfEventArrayBuffer<MapData> = net_perf_array.open(cpu_id, None)?; |
| 89 | + net_perf_buffer.push(buf); |
| 90 | + } |
| 91 | + let running = AtomicBool::new(true); |
| 92 | + |
| 93 | + let buffers = vec![BytesMut::with_capacity(1024); 10]; |
| 94 | + |
| 95 | + |
| 96 | + tokio::spawn(async move{ |
| 97 | + display_metrics_map(net_perf_buffer, running, buffers).await; |
| 98 | + }); |
| 99 | + |
| 100 | + |
| 101 | + signal::ctrl_c().await?; |
| 102 | + Ok(()) |
| 103 | +} |
| 104 | + |
| 105 | +pub async fn display_metrics_map( |
| 106 | + mut perf_buffers: Vec<PerfEventArrayBuffer<MapData>>, |
| 107 | + running: AtomicBool, |
| 108 | + mut buffers: Vec<BytesMut>, |
| 109 | +) { |
| 110 | + while running.load(Ordering::SeqCst) { |
| 111 | + for buf in perf_buffers.iter_mut() { |
| 112 | + match buf.read_events(&mut buffers) { |
| 113 | + std::result::Result::Ok(events) => { |
| 114 | + for i in 0..events.read { |
| 115 | + let data = &buffers[i]; |
| 116 | + if data.len() >= std::mem::size_of::<NetworkMetrics>() { |
| 117 | + let net_metrics: NetworkMetrics = |
| 118 | + unsafe { std::ptr::read(data.as_ptr() as *const _) }; |
| 119 | + let src = Ipv4Addr::from(u32::from_be(net_metrics.src_addr)); |
| 120 | + |
| 121 | + info!("Detected packet loss SRC: {}", src); |
| 122 | + } |
| 123 | + } |
| 124 | + } |
| 125 | + Err(e) => { |
| 126 | + error!("Error reading events: {:?}", e); |
| 127 | + } |
| 128 | + } |
| 129 | + } |
| 130 | + tokio::time::sleep(std::time::Duration::from_millis(100)).await; |
| 131 | + } |
| 132 | +} |
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