is PACKET_TX_RING expected to work on loopback?

Hey there. I'm developing an application which makes use of PACKET_TX_RING
(http://dank.qemfd.net/dankwiki/index.php/Omphalos), one mmap'd RX and TX
socket per interface. When I transmit on wireless/ethernet devices, the
packets flow out fine, and I get responses.

When I transmit on loopback, I can see the packets using tcpdump -i lo, 
send() returns 0, and the frame is set back to TP_STATUS_AVAILABLE.
Checksums are properly set and the packets appear well-formed in Wireshark.
I can't seem to read the packets, however; neither the intended DNS server
(verified via dnsmasq -d and strace) nor my own socat udp-listen process
seem to get the packets.

Is PACKET_TX_RING expected to work on loopback?

Thanks!

-- 
                                         nick black [off-list ref]
"A main cause of the Roman Empire's fall was that–lacking zero–they had
       no way to indicate successful termination of their C programs."