When I use apisix to proxy a TCP connection, how can I close this TCP connection or prevent subsequent requests?

[sugarScc]

I plan to use apisix to proxy TCP connection between client and database(ex. MySQL), but when the client wants to do some bad thing(ex. hijacking) I want to close the TCP connection, how could I implement this feature? It's better if I could ignore subsequent requests from this TCP connection and returen response like "bad request". Is there any plan?