Problem with checksum offloading on RPi3 (PF + Jails involved)

[John-Mark Gurney]

Kristof Provost wrote this message on Sun, Nov 01, 2020 at 19:48 +0100:
> On 31 Oct 2020, at 16:06, Carsten Bäcker wrote:
> > Packet-capture from the router is attached.
> >
> Okay??? but that doesn???t actually demonstrate anything at all.
> It shows an outbound packet with an incorrect checksum. See what I???ve 
> mentioned before about checksums potentially being calculated by 
> hardware.
> Given that there???s been a reply to that DNS query the checksum clearly 
> got set correctly after the packet was captured.

Actually, isn't that odd that the outbound checksum is wrong?  Since
the chip doesn't advertise (or it shouldn't) tx checksum handling,
FreeBSD's stack should have computed the checksum.

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."