Add per-listener SYN limiter for Netfilter control

Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>

src/maestro/mod.rs

@@ -45,6 +45,7 @@ use crate::stats::beobachten::BeobachtenStore;
 use crate::stats::telemetry::TelemetryPolicy;
 use crate::stats::{ReplayChecker, Stats};
 use crate::stream::BufferPool;
+use crate::synlimit_control;
 use crate::transport::UpstreamManager;
 use crate::transport::middle_proxy::MePool;
 use helpers::{
@@ -906,6 +907,9 @@ async fn run_telemt_core(
         std::process::exit(1);
     }
 
+    synlimit_control::reconcile_synlimit_rules(&config).await;
+    synlimit_control::spawn_synlimit_controller(config_rx.clone());
+
     // On Unix, caller supplies privilege drop after bind (may require root for port < 1024).
     drop_after_bind();
 

src/maestro/shutdown.rs

@@ -19,6 +19,7 @@ use tokio::signal::unix::{SignalKind, signal};
 use tracing::{info, warn};
 
 use crate::stats::Stats;
+use crate::synlimit_control;
 use crate::transport::middle_proxy::MePool;
 
 use super::helpers::{format_uptime, unit_label};
@@ -102,6 +103,8 @@ async fn perform_shutdown(
     let uptime_secs = process_started_at.elapsed().as_secs();
     info!("Uptime: {}", format_uptime(uptime_secs));
 
+    synlimit_control::clear_synlimit_rules_all_backends().await;
+
     // Graceful ME pool shutdown
     if let Some(pool) = &me_pool {
         match tokio::time::timeout(Duration::from_secs(2), pool.shutdown_send_close_conn_all())