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A virtual firewall based on Network Function Virtualization (NFV) with Software Defined Networking (SDN) provides high scalability and flexibility for low-cost monitoring of legacy networks by dynamically deploying virtual network appliances rather than traditional hardware-based appliances. However, full utilization of virtual firewalls requires efficient management of computer virtualization resources and on-demand placement of virtual firewalls by steering traffic to the correct routing path using an SDN controller. In this paper, we design P4Guard, a software-based configurable firewall based on a high-level domain-specific language to specify packet processing logic using P4. P4Guard is a protocol-independent and platform-agnostic software-based firewall that can be incorporated into software switches that is highly usable and deployable. We evaluate the efficiency of P4Guard in processing traffic, compared to our previous virtual firewall in NFV.