* is PACKET_TX_RING expected to work on loopback?
@ 2011-10-06 18:37 nick black
0 siblings, 0 replies; only message in thread
From: nick black @ 2011-10-06 18:37 UTC (permalink / raw)
To: Vitali Lovitch, Johann Baudy, David Miller; +Cc: linux-net
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 <nblack@nvidia.com>
"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."
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