Herbert Xu said the following on 2007-11-16 12:11:

Wang Chen [off-list ref] wrote:

quoted

So, I think the checksum in udp_queue_rcv_skb() actually does
the work, not that in udp_recvmsg() and udp_poll().

If I am wrong, please point out.

We may have a bug in the accounting area.  Check the recent
patch made to UDP/IPv6 which is probably needed here as well.

Like dave said, decrementing the InDataGrams in this case is an
option.
I will check the same place of UDP/IPv6.

Hmm, we really need to spend more time on merging stuff between
IPv4 and IPv6 to save all this duplication of effort.

Definitely necessary.