From 2e21cd99ef2d928e62ca8981efac2620fa7b9e15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Mon, 2 Feb 2026 14:15:10 +0800
Subject: [PATCH] Revert "Disable rp filter atomically"

This reverts commit 983b3caf40d6bd83d1bc6930facd6a83314eef5e.
---
 tun_linux.go | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/tun_linux.go b/tun_linux.go
index 42714b5..a1b5560 100644
--- a/tun_linux.go
+++ b/tun_linux.go
@@ -254,10 +254,6 @@ func (t *NativeTun) Name() (string, error) {
 }
 
 func (t *NativeTun) Start() error {
-	err := t.disableReversePathFilter()
-	if err != nil && t.options.Logger != nil && t.options.FileDescriptor == 0 {
-		t.options.Logger.Warn(E.Cause(err, "disable reverse path filter"))
-	}
 	if t.options.FileDescriptor != 0 {
 		return nil
 	}
@@ -1087,15 +1083,3 @@ func (t *NativeTun) setSearchDomainForSystemdResolved() {
 		_ = shell.Exec(ctlPath, append([]string{"dns", t.options.Name}, common.Map(dnsServer, netip.Addr.String)...)...).Run()
 	}()
 }
-
-func (t *NativeTun) disableReversePathFilter() error {
-	err := os.WriteFile("/proc/sys/net/ipv4/conf/all/rp_filter", []byte{'0'}, 0o644)
-	if err != nil {
-		return err
-	}
-	err = os.WriteFile("/proc/sys/net/ipv4/conf/"+t.options.Name+"/rp_filter", []byte{'0'}, 0o644)
-	if err != nil {
-		return err
-	}
-	return nil
-}