immediate operands. The encoding of op itself provides informa�on on which mode to use ( BPF_X for deno�ng register-based opera�ons, and BPF_K for immediate-based opera�ons respec�vely). In the la�er case on the current packet for pushing into upper layers. Last but not least, XDP_ABORTED which serves deno�ng an excep�on like state from the program and has the same behavior as XDP_DROP only that XDP_ABORTED