PFSYNC_HDRLEN
*sp = (void *)((char *)h + PFSYNC_HDRLEN);
(void *)((char *)h + PFSYNC_HDRLEN);
PFSYNC_HDRLEN + (i * sizeof(*up)));
ifp->if_hdrlen = PFSYNC_HDRLEN;
bpf_attach(&pfsyncif->sc_if, DLT_PFSYNC, PFSYNC_HDRLEN);