fix connection loss when traffic is huge

easytier/src/common/constants.rs

@@ -26,5 +26,6 @@ pub const UDP_HOLE_PUNCH_CONNECTOR_SERVICE_ID: u32 = 2;
 pub const EASYTIER_VERSION: &str = git_version::git_version!(
     args = ["--abbrev=8", "--always", "--dirty=~"],
     prefix = concat!(env!("CARGO_PKG_VERSION"), "-"),
-    suffix = ""
+    suffix = "",
+    fallback = env!("CARGO_PKG_VERSION")
 );

easytier/src/gateway/udp_proxy.rs

@@ -12,12 +12,10 @@ use pnet::packet::{
     udp::{self, MutableUdpPacket},
     Packet,
 };
+use tachyonix::{channel, Receiver, Sender, TrySendError};
 use tokio::{
     net::UdpSocket,
-    sync::{
-        mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender},
-        Mutex,
-    },
+    sync::Mutex,
     task::{JoinHandle, JoinSet},
     time::timeout,
 };
@@ -85,7 +83,7 @@ impl UdpNatEntry {
 
     async fn compose_ipv4_packet(
         self: &Arc<Self>,
-        packet_sender: &mut UnboundedSender<ZCPacket>,
+        packet_sender: &mut Sender<ZCPacket>,
         buf: &mut [u8],
         src_v4: &SocketAddrV4,
         payload_len: usize,
@@ -122,11 +120,13 @@ impl UdpNatEntry {
                 p.fill_peer_manager_hdr(self.my_peer_id, self.src_peer_id, PacketType::Data as u8);
                 p.mut_peer_manager_header().unwrap().set_no_proxy(true);
 
-                if let Err(e) = packet_sender.send(p) {
-                    tracing::error!("send icmp packet to peer failed: {:?}, may exiting..", e);
-                    return Err(Error::AnyhowError(e.into()));
+                match packet_sender.try_send(p) {
+                    Err(TrySendError::Closed(e)) => {
+                        tracing::error!("send icmp packet to peer failed: {:?}, may exiting..", e);
+                        Err(Error::Unknown)
+                    }
+                    _ => Ok(()),
                 }
-                Ok(())
             },
         )?;
 
@@ -135,7 +135,7 @@ impl UdpNatEntry {
 
     async fn forward_task(
         self: Arc<Self>,
-        mut packet_sender: UnboundedSender<ZCPacket>,
+        mut packet_sender: Sender<ZCPacket>,
         virtual_ipv4: Ipv4Addr,
     ) {
         let mut buf = [0u8; 65536];
@@ -182,7 +182,7 @@ impl UdpNatEntry {
                 &mut buf,
                 &src_v4,
                 len,
-                1200,
+                1256,
                 ip_id,
             )
             .await
@@ -213,8 +213,8 @@ pub struct UdpProxy {
 
     nat_table: Arc<DashMap<UdpNatKey, Arc<UdpNatEntry>>>,
 
-    sender: UnboundedSender<ZCPacket>,
-    receiver: Mutex<Option<UnboundedReceiver<ZCPacket>>>,
+    sender: Sender<ZCPacket>,
+    receiver: Mutex<Option<Receiver<ZCPacket>>>,
 
     tasks: Mutex<JoinSet<()>>,
 
@@ -350,7 +350,7 @@ impl UdpProxy {
         peer_manager: Arc<PeerManager>,
     ) -> Result<Arc<Self>, Error> {
         let cidr_set = CidrSet::new(global_ctx.clone());
-        let (sender, receiver) = unbounded_channel();
+        let (sender, receiver) = channel(64);
         let ret = Self {
             global_ctx,
             peer_manager,
@@ -398,7 +398,7 @@ impl UdpProxy {
         let mut receiver = self.receiver.lock().await.take().unwrap();
         let peer_manager = self.peer_manager.clone();
         self.tasks.lock().await.spawn(async move {
-            while let Some(msg) = receiver.recv().await {
+            while let Ok(msg) = receiver.recv().await {
                 let to_peer_id: PeerId = msg.peer_manager_header().unwrap().to_peer_id.get();
                 tracing::trace!(?msg, ?to_peer_id, "udp nat packet response send");
                 let ret = peer_manager.send_msg(msg, to_peer_id).await;

easytier/src/peers/peer_conn.rs

@@ -8,7 +8,7 @@ use std::{
     },
 };
 
-use futures::{SinkExt, StreamExt, TryFutureExt};
+use futures::{StreamExt, TryFutureExt};
 
 use prost::Message;
 
@@ -18,7 +18,6 @@ use tokio::{
     time::{timeout, Duration},
 };
 
-use tokio_util::sync::PollSender;
 use tracing::Instrument;
 use zerocopy::AsBytes;
 
@@ -246,7 +245,7 @@ impl PeerConn {
     pub async fn start_recv_loop(&mut self, packet_recv_chan: PacketRecvChan) {
         let mut stream = self.recv.lock().await.take().unwrap();
         let sink = self.sink.clone();
-        let mut sender = PollSender::new(packet_recv_chan.clone());
+        let sender = packet_recv_chan.clone();
         let close_event_sender = self.close_event_sender.clone().unwrap();
         let conn_id = self.conn_id;
         let ctrl_sender = self.ctrl_resp_sender.clone();
@@ -283,7 +282,9 @@ impl PeerConn {
                             tracing::error!(?e, "peer conn send ctrl resp error");
                         }
                     } else {
-                        if sender.send(zc_packet).await.is_err() {
+                        if zc_packet.is_lossy() {
+                            let _ = sender.try_send(zc_packet);
+                        } else if sender.send(zc_packet).await.is_err() {
                             break;
                         }
                     }

easytier/src/tunnel/packet_def.rs

@@ -500,6 +500,12 @@ impl ZCPacket {
     pub fn mut_inner(&mut self) -> &mut BytesMut {
         &mut self.inner
     }
+
+    pub fn is_lossy(&self) -> bool {
+        self.peer_manager_header()
+            .and_then(|hdr| Some(hdr.packet_type == PacketType::Data as u8))
+            .unwrap_or(false)
+    }
 }
 
 #[cfg(test)]

easytier/src/tunnel/ring.rs

@@ -26,7 +26,8 @@ use super::{
     StreamItem, Tunnel, TunnelConnector, TunnelError, TunnelInfo, TunnelListener,
 };
 
-static RING_TUNNEL_CAP: usize = 128;
+static RING_TUNNEL_CAP: usize = 64;
+static RING_TUNNEL_RESERVERD_CAP: usize = 4;
 
 type RingLock = parking_lot::Mutex<()>;
 
@@ -46,7 +47,7 @@ impl RingTunnel {
 
     pub fn new(cap: usize) -> Self {
         let id = Uuid::new_v4();
-        let ring_impl = AsyncHeapRb::new(cap);
+        let ring_impl = AsyncHeapRb::new(std::cmp::max(RING_TUNNEL_RESERVERD_CAP * 2, cap));
         let (ring_prod_impl, ring_cons_impl) = ring_impl.split();
         Self {
             id: id.clone(),
@@ -121,6 +122,14 @@ impl RingSink {
     }
 
     pub fn try_send(&mut self, item: RingItem) -> Result<(), RingItem> {
+        let base = self.ring_prod_impl.base();
+        if base.occupied_len() >= base.capacity().get() - RING_TUNNEL_RESERVERD_CAP {
+            return Err(item);
+        }
+        self.ring_prod_impl.try_push(item)
+    }
+
+    pub fn force_send(&mut self, item: RingItem) -> Result<(), RingItem> {
         self.ring_prod_impl.try_push(item)
     }
 }

easytier/src/tunnel/udp.rs

@@ -10,14 +10,14 @@ use std::net::SocketAddr;
 use tokio::{
     net::UdpSocket,
     sync::mpsc::{Receiver, Sender, UnboundedReceiver, UnboundedSender},
-    task::{JoinHandle, JoinSet},
+    task::JoinSet,
 };
 
 use tracing::{instrument, Instrument};
 
 use super::TunnelInfo;
 use crate::{
-    common::join_joinset_background,
+    common::{join_joinset_background, scoped_task::ScopedTask},
     tunnel::{
         build_url_from_socket_addr,
         common::{reserve_buf, TunnelWrapper},
@@ -190,7 +190,7 @@ struct UdpConnection {
     dst_addr: SocketAddr,
 
     ring_sender: RingSink,
-    forward_task: JoinHandle<()>,
+    forward_task: ScopedTask<()>,
 }
 
 impl UdpConnection {
@@ -209,7 +209,8 @@ impl UdpConnection {
             if let Err(e) = close_event_sender.send((dst_addr, err)) {
                 tracing::error!(?e, "udp send close event error");
             }
-        });
+        })
+        .into();
 
         Self {
             socket,
@@ -232,20 +233,20 @@ impl UdpConnection {
             return Err(TunnelError::ConnIdNotMatch(self.conn_id, conn_id));
         }
 
-        if let Err(e) = self.ring_sender.try_send(zc_packet) {
-            tracing::trace!(?e, "ring sender full, drop packet");
+        if zc_packet.is_lossy() {
+            if let Err(e) = self.ring_sender.try_send(zc_packet) {
+                tracing::trace!(?e, "ring sender full, drop lossy packet");
+            }
+        } else {
+            if let Err(e) = self.ring_sender.force_send(zc_packet) {
+                tracing::trace!(?e, "ring sender full, drop non-lossy packet");
+            }
         }
 
         Ok(())
     }
 }
 
-impl Drop for UdpConnection {
-    fn drop(&mut self) {
-        self.forward_task.abort();
-    }
-}
-
 #[derive(Clone)]
 struct UdpTunnelListenerData {
     local_url: url::Url,
@@ -555,8 +556,8 @@ impl UdpTunnelConnector {
         dst_addr: SocketAddr,
         conn_id: u32,
     ) -> Result<Box<dyn super::Tunnel>, super::TunnelError> {
-        let ring_for_send_udp = Arc::new(RingTunnel::new(128));
-        let ring_for_recv_udp = Arc::new(RingTunnel::new(128));
+        let ring_for_send_udp = Arc::new(RingTunnel::new(32));
+        let ring_for_recv_udp = Arc::new(RingTunnel::new(32));
         tracing::debug!(
             ?ring_for_send_udp,
             ?ring_for_recv_udp,