Add auto-redirect

redirect.go

@@ -0,0 +1,22 @@
+package tun
+
+import (
+	"context"
+
+	"github.com/sagernet/sing/common/logger"
+)
+
+type AutoRedirect interface {
+	Start() error
+	Close() error
+}
+
+type AutoRedirectOptions struct {
+	TunOptions         *Options
+	Context            context.Context
+	Handler            Handler
+	Logger             logger.Logger
+	TableName          string
+	DisableNFTables    bool
+	CustomRedirectPort func() int
+}