[Bug 240819] PF scrub drop UDP Fragment

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240819

--- Comment #1 from Kristof Provost <kp at freebsd.org> ---
I think I've reproduced this, but I don't think it's a pf bug.

The packet gets dropped and counted as a short packet because the UDP
destination port is 0. That check has been there since 2004.
The IP stack itself will also discart packets with a destination port of 0.

When I add '-p 53' to the hping command the packets do not get dropped by pf.

(Arguably it's an hping bug that it generates packets with UDP destination port
0, but its man page suggests that this is deliberate.)

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