David Miller wrote:
From: Rick Jones <[email protected]>
I'll try to go pester folks in tcpdump-workers then.
The thing to check is "TP_STATUS_CSUMNOTREADY".
When using mmap(), it will be provided in the descriptor. When using
recvmsg() it will be provided via a PACKET_AUXDATA control message
when enabled via the PACKET_AUXDATA socket option.
Figures... the "dailies" and "weeklies" for tar files of tcpdump and libpcap
source are fubar... again. I've email in to tcpdump-workers on that one. If
that isn't resolved quickly I'll learn how to access their CVS (pick an SCM, any
SCM...)
I did an apt-get of debian lenny's tcpdump and sources:
hpcpc103:~# tcpdump -V
tcpdump version 3.9.8
libpcap version 0.9.8
and that seems to show the false checksum failure and not use the
TP_STATUS_CSUMNOTREADY - at least that didn't appear in a grepping of the
sources. At first I thought it might be, but then I realized that my snaplen
was too short to get the whole TSO'ed frame so tcpdump wasn't even trying to
verify. After disabling TSO on the NIC, leaving CKO on, and making my snaplen >
1500 I could see it was doing undesirable stuff.
I'll see what top of trunk has at some point and what the folks there think of
adding-in a change.
rick jones
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