perf: heavily tune UDP socket buffers via socket2 to support 10Gbps+ micro-burst resilience

Cargo.lock

@@ -745,7 +745,7 @@ checksum = "c08d65885ee38876c4f86fa503fb49d7b507c2b62552df7c70b2fce627e06381"
 
 [[package]]
 name = "ostp"
-version = "0.1.55"
+version = "0.1.56"
 dependencies = [
  "anyhow",
  "base64",
@@ -762,7 +762,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-client"
-version = "0.1.55"
+version = "0.1.56"
 dependencies = [
  "anyhow",
  "bytes",
@@ -773,13 +773,14 @@ dependencies = [
  "rand",
  "serde",
  "serde_json",
+ "socket2",
  "tokio",
  "tracing",
 ]
 
 [[package]]
 name = "ostp-core"
-version = "0.1.55"
+version = "0.1.56"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -812,7 +813,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-server"
-version = "0.1.55"
+version = "0.1.56"
 dependencies = [
  "anyhow",
  "bytes",
@@ -820,13 +821,14 @@ dependencies = [
  "rand",
  "serde",
  "serde_json",
+ "socket2",
  "tokio",
  "tracing",
 ]
 
 [[package]]
 name = "ostp-tun-helper"
-version = "0.1.55"
+version = "0.1.56"
 dependencies = [
  "anyhow",
  "chrono",

ostp-client/Cargo.toml

@@ -16,3 +16,4 @@ serde_json = "1.0"
 json_comments = "0.2"
 portable-atomic.workspace = true
 chrono = "0.4"
+socket2 = "0.6.3"

ostp-client/src/bridge.rs

@@ -609,9 +609,14 @@ impl Bridge {
             max_sent_history: 65536, // Greatly expanded to guarantee that oldest unacked packets are not prematurely popped and lost
         })?;
 
-        let socket = UdpSocket::bind(&self.local_bind_addr)
-            .await
-            .with_context(|| format!("failed to bind local udp {}", self.local_bind_addr))?;
+        let addr = self.local_bind_addr.parse::<std::net::SocketAddr>().map_err(|e| anyhow::anyhow!("invalid bind addr: {}", e))?;
+        let domain = if addr.is_ipv6() { socket2::Domain::IPV6 } else { socket2::Domain::IPV4 };
+        let sock = socket2::Socket::new(domain, socket2::Type::DGRAM, Some(socket2::Protocol::UDP))?;
+        let _ = sock.set_recv_buffer_size(33554432); // 32MB
+        let _ = sock.set_send_buffer_size(33554432); // 32MB
+        sock.bind(&addr.into())?;
+        sock.set_nonblocking(true)?;
+        let socket = UdpSocket::from_std(sock.into())?;
 
         if self.turn_enabled {
             let turn_addr = if self.turn_server.contains(':') {

ostp-server/Cargo.toml

@@ -13,3 +13,4 @@ ostp-core = { path = "../ostp-core" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 rand.workspace = true
+socket2 = "0.6.3"

ostp-server/src/lib.rs

@@ -116,7 +116,14 @@ pub async fn run_server(
         }
     });
 
-    let socket = UdpSocket::bind(&bind_addr).await?;
+    let addr = bind_addr.parse::<std::net::SocketAddr>().map_err(|e| anyhow::anyhow!("invalid bind addr: {}", e))?;
+    let domain = if addr.is_ipv6() { socket2::Domain::IPV6 } else { socket2::Domain::IPV4 };
+    let sock = socket2::Socket::new(domain, socket2::Type::DGRAM, Some(socket2::Protocol::UDP))?;
+    let _ = sock.set_recv_buffer_size(33554432); // 32MB
+    let _ = sock.set_send_buffer_size(33554432); // 32MB
+    sock.bind(&addr.into())?;
+    sock.set_nonblocking(true)?;
+    let socket = UdpSocket::from_std(sock.into())?;
     let protocol_config = ProtocolConfig {
         role: NoiseRole::Responder,
         psk: [0u8; 32],