实现基础的DDoS防护

internal/firewalls/nftables/errors.go

@@ -0,0 +1,19 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+//go:build linux
+// +build linux
+
+package nftables
+
+import "errors"
+
+var ErrTableNotFound = errors.New("table not found")
+var ErrChainNotFound = errors.New("chain not found")
+var ErrSetNotFound = errors.New("set not found")
+var ErrRuleNotFound = errors.New("rule not found")
+
+func IsNotFound(err error) bool {
+	if err == nil {
+		return false
+	}
+	return err == ErrTableNotFound || err == ErrChainNotFound || err == ErrSetNotFound || err == ErrRuleNotFound
+}