Packet receiving in pthreads raw sockets

Question

I am doing a port scanner program as part of a school project where am using raw sockets. My understanding is this:

When using multithreading with raw sockets, each pthread does NOT get a copy of the packets seen by the NIC. Hence to handle all the different thread, I would need a receiving thread that passes messages to the correct thread.

Is this correct?

EDIT : My hypothesis is, the OS sends the packet only once to the process. If the wrong pthread was receiving the packet, the packet could be missed.

Answer 1

I think if you want to receive the packets in all threads, you just need to create a separate raw socket (with the same arguments) in each thread. I haven't found a good resource describing this on Linux, but that's how it's documented on Windows:

if several SOCK_RAW sockets are open on a computer at the same time, the same datagrams may be delivered to all the open sockets