Re: [PATCH]: libpcap: VLAN acceleration support

[Guy Harris <guy () alum mit edu>]

On Jul 16, 2008, at 5:10 AM, Patrick McHardy wrote:

> This patch adds support to libpcap to retrieve the tag from
> the auxillary data and reconstruct the original VLAN header,
> solving a major complaint about the way Linux handles VLAN
> offloading.
>
> Unfortunately both the website and CVS is down, so this patch
> is against the current Debian version.

Debian etch appears to offer a choice of libpcap 0.7.2 or 0.9.5  
(confusingly called "libpcap-0.8", perhaps trying to maintain their  
reputation as the proudly trailing-edge distribution :-)).

However, the current top of the CVS tree has significantly changed  
pcap-linux.c - it now supports memory-mapped access to PF_PACKET  
sockets.  I can send you a tarball of that, so you can see what  
changes need to be made to the memory-mapped code path (your changes  
to the non-memory-mapped code path should also be made).  From the  
"tpacket" in the "tpacket_auxdata" structure name, I suspect that  
there's a way to get at the auxiliary data from the memory-mapped  
interface.

(It's not as if I was going to be able to check your patch in any time  
soon; Michael, what's going on with {cvs,www}.tcpdump.org?  The  
mailing list is working....)
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