On Dec 17, 2012, at 1:50 AM, "David Laight" <david.lai...@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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