Re: vlan tagged packets and libpcap breakage

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

On Dec 17, 2012, at 1:50 AM, "David Laight" <David.Laight () ACULAB COM> wrote:

> How are you going to tell whether a feature is present in a non-Linux
> kernel ?

The Linux memory-mapped capture mechanism is not present in a non-Linux kernel, so all the libpcap work involved here 
would, if necessary on other platforms, have to be done differently on those platforms.  Those platforms would have to 
have their own mechanisms to indicate whether any changes to filter code, processing of VLAN tags supplied out of band, 
etc. would need to be done.

The same would apply to other additional features of the Linux memory-mapped capture mechanism that require changes in 
libpcap.  (Ideally, those changes would only require changes in order to use them, and would not break existing 
userland code, including but not limited to libpcap - your reply was to Daniel Borkmann, who is, I believe, the 
originator of netsniff-ng:

        http://netsniff-ng.org

which has its own code using PF_PACKET sockets.)

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