bpf filtering for new DLT type

["Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1 () nasa gov>]

I am trying to find information on what is needed to implement bpf filtering for a new DLT type (in my case DLT_AOS).

Initially I added to gencode.c in libpcap the following:

                case DLT_AOS:
                /*
                 * Currently, only raw "link[N:M]" filtering is supported.
                 */
                off_linktype = -1;
                off_macpl = -1;
                off_nl = -1;
                off_nl_nosnap = -1;
                return;

Now I would like to implement bpf filtering for AOS protocol. Could somebody please point me to info on the steps to 
take? Would this require rebuilding of the kernel (I am on linux)?

Do I need to modify grammar.y and scanner.l ? If yes, what else needs to be done?

Regards,
Eric
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