From ed6f61ea2adf657fdd3a088d83afef7952d7359d Mon Sep 17 00:00:00 2001
From: lbl <1791778603@qq.com>
Date: Fri, 21 Aug 2026 01:55:02 +0800
Subject: [PATCH] =?UTF-8?q?fix(p2p):=20=E8=B7=AF=E7=94=B1=E8=AF=84?=
 =?UTF-8?q?=E5=88=86=E5=88=86=E6=AF=8D=20u32=20=E6=BA=A2=E5=87=BA?=
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rtt > 约39s 时 rtt * (10000 + loss_v * 10) 超出 u32 范围，
debug 构建下直接 panic，release 下评分错误。

改用 u64 计算并钳制回 u32。

测试：test_get_channel_score_large_rtt_no_overflow 覆盖 u32::MAX rtt
与正常大小关系。
---
 vnt-core/src/tunnel_core/p2p/route_table.rs | 26 ++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/vnt-core/src/tunnel_core/p2p/route_table.rs b/vnt-core/src/tunnel_core/p2p/route_table.rs
index 5182333..954e991 100644
--- a/vnt-core/src/tunnel_core/p2p/route_table.rs
+++ b/vnt-core/src/tunnel_core/p2p/route_table.rs
@@ -87,13 +87,14 @@ pub fn get_channel_score(rtt: u32, loss_v: u32, is_relay: bool) -> u32 {
     let weight = if is_relay { 100 } else { 120 };
     let k_adj = 10; // 丢包惩罚系数
 
+    // 用 u64 计算避免溢出：分母最大 rtt * 110000，rtt > 约39s 时 u32 溢出
     // 分子：代表"有效做功"的放大值
-    let numerator = weight * (10000 - loss_v) * 100;
+    let numerator = weight as u64 * (10000 - loss_v) as u64 * 100;
 
     // 分母：代表"链路阻力"
-    let denominator = rtt * (10000 + loss_v * k_adj);
+    let denominator = rtt as u64 * (10000 + loss_v * k_adj) as u64;
 
-    numerator / denominator
+    (numerator / denominator).min(u32::MAX as u64) as u32
 }
 
 #[derive(Clone)]
@@ -319,3 +320,22 @@ impl RouteTableInner {
         expired_keys
     }
 }
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// rtt 极大（>39s）时分母不能 u32 溢出（debug 构建下溢出会 panic）
+    #[test]
+    fn test_get_channel_score_large_rtt_no_overflow() {
+        let score = get_channel_score(u32::MAX, 0, false);
+        assert_eq!(score, 0);
+        let score = get_channel_score(u32::MAX, 10000, true);
+        assert_eq!(score, 0);
+        // 正常值结果与预期一致：低 rtt 零丢包得分高
+        let good = get_channel_score(10, 0, false);
+        let bad = get_channel_score(1000, 5000, true);
+        assert!(good > bad);
+    }
+}