feat: configurable TCPKeepAlive interval

listener/redir/tcp.go

@@ -4,6 +4,7 @@ import (
 	"net"
 
 	"github.com/Dreamacro/clash/adapter/inbound"
+	N "github.com/Dreamacro/clash/common/net"
 	C "github.com/Dreamacro/clash/constant"
 )
 
@@ -66,6 +67,6 @@ func handleRedir(conn net.Conn, in chan<- C.ConnContext, additions ...inbound.Ad
 		conn.Close()
 		return
 	}
-	conn.(*net.TCPConn).SetKeepAlive(true)
+	N.TCPKeepAlive(conn)
 	in <- inbound.NewSocket(target, conn, C.REDIR, additions...)
 }