Add Chain API for managing nftables chains, including Add, Create, Delete, Clear, and Rename operations.

chain/hook.go

@@ -0,0 +1,36 @@
+package chain
+
+import "fmt"
+
+type Hook int8
+
+const (
+	HookInput Hook = iota
+	HookOutput
+	HookForward
+	HookPrerouting
+	HookPostrouting
+	HookIngress
+	HookEgress
+)
+
+func (h Hook) String() string {
+	switch h {
+	case HookInput:
+		return "input"
+	case HookOutput:
+		return "output"
+	case HookForward:
+		return "forward"
+	case HookPrerouting:
+		return "prerouting"
+	case HookPostrouting:
+		return "postrouting"
+	case HookIngress:
+		return "ingress"
+	case HookEgress:
+		return "egress"
+	default:
+		return fmt.Sprintf("unknown hook %d", h)
+	}
+}