fix kcp not work as expect (#1285)

easytier/src/gateway/kcp_proxy.rs

@@ -266,6 +266,11 @@ impl<C: NatDstConnector, T: TcpProxyForKcpSrcTrait<Connector = C>> NicPacketFilt
                 .check_dst_allow_kcp_input(&ip_packet.get_destination())
                 .await
             {
+                tracing::warn!(
+                    "{:?} proxy src: dst {} not allow kcp input",
+                    self.get_tcp_proxy().get_transport_type(),
+                    ip_packet.get_destination()
+                );
                 return false;
             }
         } else {
@@ -288,6 +293,12 @@ impl<C: NatDstConnector, T: TcpProxyForKcpSrcTrait<Connector = C>> NicPacketFilt
             if ip_packet.get_source() != my_ipv4.address()
                 && !self.get_tcp_proxy().is_smoltcp_enabled()
             {
+                tracing::warn!(
+                    "{:?} nat 2 nat packet, src: {} dst: {} not allow kcp input",
+                    self.get_tcp_proxy().get_transport_type(),
+                    ip_packet.get_source(),
+                    ip_packet.get_destination()
+                );
                 return false;
             }
         };

easytier/src/gateway/quic_proxy.rs

@@ -200,6 +200,11 @@ impl TcpProxyForKcpSrcTrait for TcpProxyForQUICSrc {
         let Some(peer_info) = peer_map.get_route_peer_info(dst_peer_id).await else {
             return false;
         };
+        tracing::debug!(
+            "check dst {} allow quic input, peer info: {:?}",
+            dst_ip,
+            peer_info
+        );
         let Some(quic_port) = peer_info.quic_port else {
             return false;
         };

easytier/src/gateway/tcp_proxy.rs

@@ -24,6 +24,7 @@ use crate::common::error::Result;
 use crate::common::global_ctx::{ArcGlobalCtx, GlobalCtx};
 use crate::common::join_joinset_background;
 
+use crate::common::stats_manager::{LabelSet, LabelType, MetricName};
 use crate::peers::peer_manager::PeerManager;
 use crate::peers::{NicPacketFilter, PeerPacketFilter};
 use crate::proto::cli::{
@@ -722,6 +723,21 @@ impl<C: NatDstConnector> TcpProxy<C> {
             nat_entry.real_dst
         };
 
+        global_ctx
+            .stats_manager()
+            .get_counter(
+                MetricName::TcpProxyConnect,
+                LabelSet::new()
+                    .with_label_type(LabelType::Protocol(
+                        connector.transport_type().as_str_name().to_string(),
+                    ))
+                    .with_label_type(LabelType::DstIp(nat_dst.ip().to_string()))
+                    .with_label_type(LabelType::MappedDstIp(
+                        nat_entry.mapped_dst.ip().to_string(),
+                    )),
+            )
+            .inc();
+
         let _guard = global_ctx.net_ns.guard();
         let Ok(dst_tcp_stream) = connector.connect(nat_entry.src, nat_dst).await else {
             tracing::error!("connect to dst failed: {:?}", nat_entry);