netdev - UDP recvfrom/recv question on connected/unconnected sockets

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Message-ID: <CAHb6LvpdHujbScC1YrVnwM5Nfp_HaSn1EAnT2eY87ZCWgXQ88w@mail.gmail.com>
Date: Thu, 18 Apr 2024 10:07:51 -0700
From: Bob McMahon <bob.mcmahon@...adcom.com>
To: netdev@...r.kernel.org
Subject: UDP recvfrom/recv question on connected/unconnected sockets

Hi All,

I have a question about the OS routing UDP packets to threads and connect
vs unconnected sockets. Same src/dst IP and same dst port, different src
port.

If there are two UDP sockets listening on the same port, each serviced by
its own thread and they both hang a recvfrom() or recv() (for the connected
socket,) will the OS route packets only to the thread with a connected
socket vs the thread with th unconnected socket? If not, what will happen?

Bob

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