Re: LINKTYPE_LINUX_SLL2 implementation (libpcap & tcpdump)

[Guy Harris <gharris () sonic net>]

On Jul 11, 2018, at 7:06 AM, Petr Vorel <pvorel () suse cz> wrote:

> It looks like 1) is impossible the need for both to define
> pcap_create_interface().

Currently, the list isn't set in pcap_create(), it's set in pcap_activate(), so it'd be set in pcap_activate_linux().

You would then either

        1) have the "cooked mode" read-a-packet code check handle->linktype for DLT_LINUX_SLL or DLT_LINUX_SLL2 and 
decide based on that whether to use the SLL or SLL2 header

or

        2) replace the "cooked" member of the private structure with an enum supporting "raw mode", "SLL cooked mode", 
and "SLL2 cooked mode", and have the read-a-packet code decide how to process a packet based on that.

So how is it impossible to implement 1)?
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