return XDP_PASS;

XDP_PASS is a return value used in the eXpress Data Path (XDP) framework to indicate that the packet should be passed through to the next layer of the networking stack. It is typically used in XDP programs written in C or BPF (Berkeley Packet Filter) to filter and process incoming network packets. When a packet is passed with XDP_PASS, it is delivered to the next layer of the networking stack, such as the networking driver or the kernel network stack, for further processing.