调整路径探测协议

vnt-core/src/protocol/ip_packet_protocol.rs

@@ -106,6 +106,8 @@ pub enum MsgType {
     RpcRes = 15,
 
     Quic = 17,
+    RelayProbe = 18,
+    RelayProbeReply = 19,
 }
 impl From<MsgType> for u8 {
     fn from(val: MsgType) -> Self {
@@ -138,7 +140,9 @@ impl TryFrom<u8> for MsgType {
             14 => MsgType::RpcReq,
             15 => MsgType::RpcRes,
 
+            16 => MsgType::RelayProbe,
             17 => MsgType::Quic,
+            18 => MsgType::RelayProbeReply,
             _ => {
                 return Err(io::Error::new(
                     io::ErrorKind::InvalidInput,

vnt-core/src/tunnel_core/p2p/inbound.rs

@@ -261,6 +261,30 @@ impl P2pInboundHandler {
             }
             MsgType::PingTurn => {}
             MsgType::PongTurn => {}
+            MsgType::RelayProbe => {
+                let metric = ctx.max_ttl - ctx.ttl;
+                self.route_table
+                    .add_route_if_absent(ctx.src_ip, Route::from_default_rt(route_key, metric));
+                let mut packet = NetPacket::new(TransmissionBytes::zeroed_size(
+                    HEAD_LENGTH,
+                    self.packet_crypto.encrypt_reserve(),
+                ))?;
+                packet.set_msg_type(MsgType::RelayProbeReply);
+                packet.set_ttl(1);
+                packet.set_src_id(ctx.dest_ip.into());
+                packet.set_dest_id(ctx.src_ip.into());
+                self.packet_crypto.encrypt_in_place(&mut packet)?;
+                tunnel
+                    .send_to(packet.into_bytes().into_buffer(), route_key.addr())
+                    .await?;
+            }
+            MsgType::RelayProbeReply => {
+                let metric = ctx.max_ttl - ctx.ttl;
+                self.route_table.add_route(
+                    ctx.src_ip,
+                    Route::from_default_rt(route_key, metric),
+                );
+            }
             _ => {}
         }
         Ok(())

vnt-core/src/tunnel_core/p2p/transport/task.rs

@@ -240,23 +240,21 @@ pub async fn relay_probe_task(
             };
 
             for (relay_ip, route_key) in selected_peers {
-                // 构造Ping消息，目标是target_ip，但发送给relay_ip
-                let Ok(mut ping) = NetPacket::new(TransmissionBytes::zeroed_size(
-                    HEAD_LENGTH + 8,
+                // 构造RelayProbe消息，目标是target_ip，但发送给relay_ip
+                let Ok(mut probe) = NetPacket::new(TransmissionBytes::zeroed_size(
+                    HEAD_LENGTH,
                     socket_manager.encrypt_reserve(),
                 )) else {
                     continue;
                 };
 
-                ping.set_msg_type(MsgType::Ping);
-                ping.set_ttl(2); // TTL设为2，允许中继一次
-                ping.set_src_id(src.into());
-                ping.set_dest_id((*target_ip).into());
-                ping.set_payload(&crate::utils::time::now_ts_ms().to_be_bytes())
-                    .unwrap();
+                probe.set_msg_type(MsgType::RelayProbe);
+                probe.set_ttl(2); // TTL设为2，允许中继一次
+                probe.set_src_id(src.into());
+                probe.set_dest_id((*target_ip).into());
 
                 // 发送给已打洞的客户端，让它中继到目标
-                if let Err(e) = socket_manager.send_to(ping, &route_key).await {
+                if let Err(e) = socket_manager.send_to(probe, &route_key).await {
                     log::debug!(
                         "Failed to send relay probe to {} for target {}: {:?}",
                         relay_ip,