Idea:
The first way is to create a brand-new packet in the bpf program and send it to the specified receiver.
The second way is to copy a packet. To make it easy to distinguish, below I call the packet I get from copying as packet_copy. Then I can modify the packet_copy so it can be sent to the specified receiver, and the original packet will go through the normal path.
Try:
As to the first way, I have not found a suitable solution, but someone says that this way is not possible.
As to the second way, I found bpf_clone_redirect() as a possible solution. However, instead of getting the packet_copy from copying, we should directly modify the original packet (so that it can be redirected to the specified receiver) and then call bpf_clone_redirect to redirect it. I also need to undo the modification to restore the packet after calling bpf_clone_redirect because I want this packet to be processed normally rather than dropped.
Question:
As to the first way, I would like to know if it is feasible.
As to the second way, I wonder if it can be optimized, given that bpf_clone_redirect has its limitations.
