From e88ed52dbc1e402f503fd8ce225318ce961abfa8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Wed, 28 Jan 2026 15:47:10 +0800
Subject: [PATCH] Fix auto_redirect on IPv6-only or IPv4-only servers

---
 tun_linux.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tun_linux.go b/tun_linux.go
index abca009..e4d1044 100644
--- a/tun_linux.go
+++ b/tun_linux.go
@@ -630,6 +630,23 @@ func (t *NativeTun) rules() []*netlink.Rule {
 			it.Family = unix.AF_INET6
 			rules = append(rules, it)
 		}
+		// Fallback rules after system default rules (32766: main, 32767: default)
+		// Only reached when main and default tables have no route
+		const fallbackPriority = 32768
+		if p4 {
+			it = netlink.NewRule()
+			it.Priority = fallbackPriority
+			it.Table = t.options.IPRoute2TableIndex
+			it.Family = unix.AF_INET
+			rules = append(rules, it)
+		}
+		if p6 {
+			it = netlink.NewRule()
+			it.Priority = fallbackPriority
+			it.Table = t.options.IPRoute2TableIndex
+			it.Family = unix.AF_INET6
+			rules = append(rules, it)
+		}
 		return rules
 	}